Malicious PDF — malware analysis report

Static analysis result for SHA-256 da47947e85049548…

MALICIOUS

PDF

86.1 KB Created: 2021-04-27 23:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 423b6322d0b3a496f593d599531463e0 SHA-1: de08cc4b72d0aee4848a5509c2989df34110cf29 SHA-256: da47947e850495487168386d59ba2f27e2a574dfee2d4076089eca39fda459ee
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=lista+de+verbos+en+ingles+en+presente+simple+pdf PDF link annotation
    • https://fedebeforejasu.weebly.com/uploads/1/3/4/4/134498020/nolixi.pdfIn PDF document text
    • https://vikuwavek.weebly.com/uploads/1/3/4/5/134506456/96a3c83cb8ad.pdfIn PDF document text
    • https://tomovomat.weebly.com/uploads/1/3/4/6/134617768/2099580.pdfIn PDF document text
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/2f914b315.pdfIn PDF document text
    • https://merudaxesu.weebly.com/uploads/1/3/1/3/131383629/e9d6a41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9638f8b-49ef-4ee3-9f62-f84d0a7df9fc/does_canada_require_gre.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_aeafc01a9f284dda929bf704c18e85dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c380e6b2-f1d5-4717-8973-862fdb8ae4b9/fewiv.pdfIn PDF document text
    • http://puwagof.rf.gd/asus_v621_graphics_card_driver_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/gnome_warlock_leveling_guide_vanilla.pdfIn PDF document text
    • http://gidumelefot.epizy.com/76617555819.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/simple_business_case_template_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e7847a-b9a1-4b1d-a776-86e489aadc5c/vurifima.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/jedisovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20e3808-6cee-4ba9-9a54-cb6a99b803b7/how_much_to_install_a_20kw_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/tier_1_spcc_plan_template.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_8dec1b9f2a2f4b8e8e8108387ec03f47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c029a7b1-2d64-4370-bb6c-032055644bbf/tafamajopakusurukigira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b66fc8d-bac7-4ddd-b7cc-939967247cec/kaxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/fallout_4_nexus_mods_not_working.pdfIn PDF document text
    • http://gavilisijev.rf.gd/73049846147.pdfIn PDF document text
    • http://poresiz.epizy.com/vimeo_video_player_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 5500 bytes
SHA-256: 34602cecc42414e0fd3539dc1b7559cd22eaf3ee407795e0c713a8a82edb7e0e
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 11104 bytes
SHA-256: 06aaf864570a0ce8aaf33ae72d01bf9607254d9d97d62dc5e8b91351bad27005
font_02_sfnt_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e