Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd7ae9d4c6c79ac…

MALICIOUS

PDF

82.8 KB Created: 2021-03-31 04:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 248d9c55c8b41ac937e6aac8fc2d96fb SHA-1: 114f35d11dc4e470f4617650ad524284720ed4ed SHA-256: 9cd7ae9d4c6c79aca93cf43f4ba2aa89d7b9a5b6778374eb1ac57b81ab58f628
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 0.9997

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://fokemale.ru/award?keyword=finance+clerk+interview+questions+and+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/fazejitev/W0jghce/rummikub_game_online_with_friends.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/4424704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_603518af436f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_60383b0e1cdb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_6026a37d0926d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_6015305fcc9c2.pdfIn PDF document text
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/3436900.pdfIn PDF document text
    • https://zinikigi.weebly.com/uploads/1/3/1/4/131453967/d16ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fec6817aa24c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fda0bc507206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_601174284218f.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/Whc6HuN/69887063075.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/7jijagg/winter_war_finland_sniper.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/kuzarusuwop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378827/normal_5fc8c19222ec0.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/4f07e746-9a4d-418f-834d-39b5e43a15a8/9936988885.pdfIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_45200cd8f41744bdb33517f881df714a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79073f23-13fa-464a-9005-a754a77fa97b/i_102_how_long_does_it_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f092a52d-8373-4203-ab60-1a33a3f79ecd/how_to_pair_vizio_speaker_to_phone.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_9c1bd89a7a41443197a19747b2ad61c1.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_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 5448 bytes
SHA-256: bc3ac4c0b02e599f7e4fab23db537f3ee8d7d7cef816dada7eb97dadbfaf42cc
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10584 bytes
SHA-256: 879f4c974b0eb439254b6e27450ba44fce58807bc1c4f3f4d66d9267738b8b63

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