Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82401374d9ae45b…

MALICIOUS

PDF

80.3 KB Created: 2021-04-07 03:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d947e470274f44153fc4fb5080289bcd SHA-1: 5bfa33666f584ceacc258b485d078e5b9cce31e5 SHA-256: d82401374d9ae45b902ae8e2254ea39fee61587426e3f24a526635208d5fa70e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or SEO manipulation, rather than delivering a direct payload within the PDF itself.

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://druttle.ru/award?keyword=english+words+borrowed+from+french+pdf PDF link annotation
    • https://wamogulaforuxi.weebly.com/uploads/1/3/0/8/130874075/879252.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/9267637.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/9433453.pdfIn PDF document text
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/6275774.pdfIn PDF document text
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/7868740.pdfIn PDF document text
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/nidazubaxe_xukabefu_muwigos.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/3477254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/90c990da-6dc7-4cb8-9e52-69b3c9e3fc39/merry_go_round_poem_langston_hughes_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669b0d33-3f65-4cea-9ab7-84775ab563fd/pazevojisobor.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_72206a808c254d47a9c97923ad22a9eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ad779b-ca98-46da-8b0e-c8ad2c3b0636/pemibuzelaveninifoputag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ccd15e8-353b-48fb-87ad-b0ad5126bd03/debasoladum.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_209dd7819fab44629153542c9550c7a0.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_e26b343d76ad41d791df81f7c9a05e10.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_bb48deb7feaa4f678abf9d5060c58464.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b67557-fe1b-4777-9d30-82a2c269e58a/64978942777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8bc502-0317-41f4-bcf9-4811f99b83fe/93885763742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a7a455-8373-45df-90b5-9af97cd7caa0/94621793008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b8c01a-fcc6-4926-8f1f-2be441bded7f/lobesobimavotefos.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_aa479e01c0e249829ee047114be50128.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5256 bytes
SHA-256: 5332848c0a6cbd6a7e349a5f1176277be7a6d7c45919c30cfdd7b1d984aff0cb
font_01_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 11808 bytes
SHA-256: 80c5e9e05d5c31ad77108150a7bc39812019dc0b528cc177a726bab04ad12579
font_02_sfnt_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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