Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a025f209e148be…

MALICIOUS

PDF

114.7 KB Created: 2021-05-30 01:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad307f3281f1560bba4e66b590533ff0 SHA-1: 110d6c30953701299b8b99d72732f851a787d23e SHA-256: a7a025f209e148bea893abbd0abd981233589e6ad77fbc788fd22bafab0a8062
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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/123?utm_term=bartlett%2527+s+familiar+quotations+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449777/normal_6054fc3bb478f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_60182eb9c25c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_60450e8fa7316.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/dumodipojomar.pdfIn PDF document text
    • https://fiwazapabuw.weebly.com/uploads/1/3/4/3/134357015/xumefagani.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/sojoralaw-vuxuwikizukaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426942/normal_606b84f28c108.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404753/normal_5fe42762521dc.pdfIn PDF document text
    • https://pazibeze.weebly.com/uploads/1/3/1/6/131636707/pivukus.pdfIn PDF document text
    • https://loxojugeg.weebly.com/uploads/1/3/4/5/134589710/sexabeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_6058157ead480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5fd94fcea7111.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/085b221e-e599-4df8-b092-1edcb922ffe0/21021583118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db62616-7d31-4bd7-a7dc-4d3d9bffe6ef/how_to_convert_jpg_files_to_files_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a40ebc-fd6e-4d23-b773-629b20acd99a/how_do_i_find_my_verizon_hotspot_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f586360-3284-46e7-b3f3-1665354f4ff9/xaxiriwupibimasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e503830a-8680-4aa9-bb2f-d099fd93da17/79973057392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a28057-1aa6-494b-8d39-2a6f4856b00f/how_to_use_printable_iron_on_vinyl_with_cricut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8894f028-cd2f-44e2-b851-e21447b6f578/elgato_hd60_s_capture_card_review.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_off000185ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185CA 5396 bytes
SHA-256: 64904f5e829bbab47bc8562770ce51853dbc65b5fa8a8d416d5796da70908f9f
font_01_sfnt_off00019815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19815 10908 bytes
SHA-256: 5a2f42d2e2b9a5fe20053a3adef08dc42c1bc80a9b5969c3a7e00a13932498cd

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