Malicious PDF — malware analysis report

Static analysis result for SHA-256 744a306b0192a8d9…

MALICIOUS

PDF

99.2 KB Created: 2021-03-29 19:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b97712182544ff137b7d2f5318b0520 SHA-1: 26d40c738f6910f55610d4385acdb377c300bd2d SHA-256: 744a306b0192a8d9c34844b22f91bf0794424100cbb34d7ce24762087885b9ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. One of the primary external links identified is 'https://zajinet.ru/strik?utm_term=what+would+uncle+iroh+say'. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the structure and external links point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=what+would+uncle+iroh+say PDF link annotation
    • https://cdn.sqhk.co/xokipuxat/wjfoifr/running_fred_2_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/jijBSLL/trackitt_perm_may_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/PjgY9gg/clock_face_crossword_puzzle_clue.pdfIn PDF document text
    • http://sexesex.site/dna_structure_review_worksheet5pie9.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/jmxfpgd/barcode_scanner_driver_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/jhcha62/20056490240.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/jfjbib3/bitcoin_master_bitcoin_cloud_mining.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/qZhihco/vevuvowuvilusuzun.pdfIn PDF document text
    • http://trend-sales.fun/bridgedale_socks_size_guideynomq.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/hhcjghc/tower_defense_galaxy_td_level_12.pdfIn PDF document text
    • http://cabinetshq.xyz/49614352390y6v7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/596c714f-845e-4c1a-890b-bcbd96608d4b/how_do_i_send_a_fax_on_my_brother_mfc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0902a05-f162-460d-a084-d2c9a2c58d17/10065574735.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/donagotedobogi.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_5c36b27cda1e4f9baa3ef0ad48cea589.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_e976e5bbcacf4bbebd758271f071595e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/stairway_to_heaven_solo_bass_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfc7c87-d4cb-4a7e-b3d9-20fda61117cc/ejemplos_de_propiedades_mecanicas_de_los_materiales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00847354-b37d-428a-a736-93aee73f5f10/av500_powerline_adapter_reset.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_7fa078a105ef469ca86470a3c922182e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalasawu/jifomivoborulazatefe.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_1df84ad23eeb4506bd4ec461d0016200.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fd6732-1bbd-4387-a30b-31e4761bef8f/what_is_the_economic_interdependence_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/photoshop_polaroid_frame_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/85653522102.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 5116 bytes
SHA-256: a317c41b3724fefc8ee97840eed2eed1b68b8c24ca24ed405a0f7adf2a3e5f51
font_01_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 4768 bytes
SHA-256: 22746dbfbc14be12124b369b4609981d85cb5e8a30dde0e1975f17340dc1427d
font_02_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 11640 bytes
SHA-256: 1106714aca6448102964a0f673af85396f7f03a989bd03e4b47c9c3e6249b537
font_03_sfnt_off000159d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D7 16168 bytes
SHA-256: 8c1e3298cb301b6aa2c2aeff0a89e1cafee6626e56d5ffa98ad52a7598c40df9
font_04_sfnt_off00016edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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