Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd361254d1bf6a77…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 19:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2ec3c43fe0484262f592ac08a460398 SHA-1: ac6740ebab1528901098912de9f80adb6197e969 SHA-256: bd361254d1bf6a77fe22db84fb5f3910fbdb2c5d10ea8364779ebf26f4a32e80
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=abstract+painting+techniques+pdf PDF link annotation
    • https://cdn.sqhk.co/lewonuvaxu/ejilTjg/30501264451.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/5508724.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/7366714.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/mheiahh/final_fantasy_viii_remastered_ps4_cheats.pdfIn PDF document text
    • http://floradoma.net/mujuder5at1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5ff9e0bc3b95a.pdfIn PDF document text
    • http://gladkoe-telo.xyz/bulova_precisionist_watch_reviewe87uy.pdfIn PDF document text
    • https://cdn.sqhk.co/mubikidom/jgigfii/axis_football_2020_release_date_ps4.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/navaxenesunux.pdfIn PDF document text
    • http://omerkatanalp.com/bryant_plus_90_furnace_error_code_14gn65g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467601/normal_6040e9c728ee8.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/5976751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_603a43899b797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_1932bf9cfc3e4a94b9e535c8576715c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/462d6703-667e-4d14-bf98-74ad6ab40029/launch_book_jeff_walker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f20c0dc-a5d0-4a15-9396-946bac751ee7/how_to_wear_drill_sergeant_hat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9005c93-bece-41a4-aca0-a79d39cdee20/42797066190.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_4ee44446c70440c19468a74b72768e3a.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_b9448e9880624b188e96366ed553f500.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/772fb900-15f2-4d78-93da-564f203ad5fe/human_anatomy_and_physiology_lab_manual_cat_version_13th_edition.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_93191dd7322241019c678ec9f002af85.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_8524035d3f7e4d6c9825c125b9002c1a.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 5640 bytes
SHA-256: 970a5b1da43c95d2da2f943751d4e3fed448e5971477766df84134e47b0d7cba
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 10684 bytes
SHA-256: c87f4c930247a6b3f02ab81ef6044e5ed6bc32413f384e96c8e98dcd513abd1c