Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdafb722c2719b44…

MALICIOUS

PDF

89.8 KB Created: 2021-04-03 19:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b49dd020baac80c0170b9974db51d1f4 SHA-1: df9c76b238e69ecac7dc7558dbeba38f2262c66b SHA-256: bdafb722c2719b44fa5ea2c4d8701dd85cd149d36722ef95f228955cd9f13de5
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic 'PDF_SEO_LINK_FARM' indicates a significant number of links, suggesting an attempt to manipulate search engine results or direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=business+minded+books+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416510/normal_604f6c1593c4e.pdfIn PDF document text
    • https://lexabebuwapo.weebly.com/uploads/1/3/1/3/131383838/226f565f215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fd05fec47f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403143/normal_5ff635e83e00a.pdfIn PDF document text
    • https://cdn.sqhk.co/dibadigodem/PjgHibV/tunnel_of_colors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_604e532e850fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_604021524683f.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/gutoxufogukokufusif.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/cgeMIji/are_steam_games_virus_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_6067ca0ac721e.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/pnl2jhh/ralesavaxizuvugewezid.pdfIn PDF document text
    • https://cdn.sqhk.co/nivopekodi/jg4ihhj/64499834828.pdfIn PDF document text
    • https://rawamujorutemet.weebly.com/uploads/1/3/4/3/134360263/zatokiwojoxibuzaxeku.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/xemidim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5ff070e834250.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/a875c51c-21be-4bc5-8dbe-ab1f16253a04/67707999779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a8e754-a6e6-45fc-822f-de1d42d86da3/motazafawepedul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93baf7b-23ac-4bc8-8757-cc34fa087c24/the_magic_tree_house_books_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03db66e-560c-4e49-b74e-92932d34f4c8/how_to_stop_losing_weight_after_gastric_sleeve_surgery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fff903-176c-4ee8-bc9f-d6f3aaee8124/noxabirezipufivibozewuref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c23a0ed-8ae6-427a-82ba-a78df47c3d76/28013841747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826e9aa3-fb3c-42b8-ab3d-afbf81046986/magexazufuwinijij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2aa928-2b8f-49da-8640-4ffad30a5102/12822455633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5473fa42-1115-4866-a434-e5c8cfa74b2f/nitro_pro_9_free_download_for_windows_7_32_bit_with_crack.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 5100 bytes
SHA-256: 86ecf4a52bb0cebdf091d1ea9e276b449085273205a98ba9717a6a9eb552b5fc
font_01_sfnt_off00013437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 11260 bytes
SHA-256: 3aca9c8b21c03e65535cae5189a800ecbc48f45863a7b99a424f37fc9e788a57

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