Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db4c51ac4b5a1eb…

MALICIOUS

PDF

83.8 KB Created: 2021-03-20 23:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a0ad7b22ad13936fc9b8eea2019e716 SHA-1: d4b5562fc37bb896efdfd4b01fbb92997dd84ad4 SHA-256: 8db4c51ac4b5a1ebf6006f4d44add96907064b78d698464bd4c485c006f97a89
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, many of which are SEO-themed and likely part of a link farm designed to drive traffic to malicious sites. The primary URL, 'https://botokaw.ru/wix?keyword=heat+transfer+worksheet+answer+key+pdf', suggests a lure to disguise the malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=heat+transfer+worksheet+answer+key+pdf
    • https://cdn.sqhk.co/reposivekow/ghcge41/guwodamirekeku.pdf
    • https://cdn.sqhk.co/japuwejede/LTjfohb/acumed_distal_radius_technique_guide.pdf
    • https://cdn.sqhk.co/pifonode/fiwnKI8/75222868588.pdf
    • https://cdn.sqhk.co/tibapopedeka/ggiaqje/steam_gift_card_digital_code_amazon.pdf
    • https://cdn.sqhk.co/reruzemafow/CXGnjg8/romancing_saga_2_wiki.pdf
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/masujezevi.pdf
    • http://giruzogenoxam.iblogger.org/75816188691.pdf
    • https://cdn.sqhk.co/xenudipu/ohihgjj/kubicle_promo_code.pdf
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/2529454.pdf
    • https://cdn.sqhk.co/jurugaguvedu/cRhd1fE/81106480719.pdf
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/5b893cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/480afae0-7cfe-4d09-87df-7ef162d9e810/harbor_freight_6_gallon_air_compressor_review.pdf
    • http://mugofunuwutav.epizy.com/bujebulob.pdf
    • http://fikikozazilut.rf.gd/25806559038.pdf
    • https://uploads.strikinglycdn.com/files/43e99996-f2fa-4cb0-b1cd-b58709c1a3b5/ti_84_calculator_online_version.pdf
    • http://votofeki.epizy.com/air_purifier_does_not_work.pdf
    • https://uploads.strikinglycdn.com/files/9a9c8412-9b03-405d-8105-9c07d0811c14/the_magic_tree_house_author.pdf
    • https://uploads.strikinglycdn.com/files/76f324fa-64b7-44e4-9f16-cf04fae0264f/fleck_5600_sxt_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/802cb5d7-9cce-4fb9-bca8-cc11b9778095/what_is_marbury_vs_madison_quizlet.pdf
    • https://uploads.strikinglycdn.com/files/2eca9a3c-1510-4b94-8560-b11b6807e9aa/how_to_fill_a_tax_declaration_form.pdf
    • https://uploads.strikinglycdn.com/files/e7483e33-eee1-4dff-9025-dc5ec5cf644d/why_wont_my_epson_print_black_ink.pdf
    • http://nixelotiseze.epizy.com/netixufimetunozilat.pdf
    • https://uploads.strikinglycdn.com/files/fc96ae7e-a655-4e1a-9615-5a23566a64ee/free_marvel_graphic_novels_online.pdf
    • https://uploads.strikinglycdn.com/files/f434fdc5-3a44-4bf0-8beb-b989f1d7b56d/bekelegasokapokegekitovu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109fb.bin
66d585dff5d27f084901e125653d1407e9bc1c1dd6b45ee8d89a8ec30805dd0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 5316 bytes
font_01_sfnt_off00011c23.bin
5d995a0b4d2d7fc46fcdd19352f8070a7188fb8e60809ac600c0beb434772891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10988 bytes

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