Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b8910e8b3109fd…

MALICIOUS

PDF

189.8 KB Created: 2021-03-21 04:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 004545f9a57349c5e80bb5480be702ea SHA-1: 0efe46132050c5fbb41bb6472334d267bfd08daa SHA-256: 23b8910e8b3109fd0a2839400ae936274b1ae7a3e7bd960b67b2abe0d28328f1
146 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. It uses a callback-phone (TOAD) lure. 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 0.9961

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=panasonic+kx-tg7645m+dect+6.0+manual PDF link annotation
    • https://fegejakir.weebly.com/uploads/1/3/5/2/135299458/3ad50da6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fd68d8b64e2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fde7ce0f3a22.pdfIn PDF document text
    • https://vubinejenifa.weebly.com/uploads/1/3/4/4/134444695/penazizur_nizad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_60203e363ea94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418968/normal_5ff03c58c9887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fcbb7a7d1a81.pdfIn PDF document text
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/3653771.pdfIn PDF document text
    • https://cdn.sqhk.co/jorimalid/hiUifji/56932472374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420438/normal_600abac257dac.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/1gvgc2R/boswells_school_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/ihjeggx/marep.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/599c66b01042682.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/2tWGiiz/52373438387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465262/normal_5fc77a6b5bd83.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/02455aff-868e-4ab1-a9e2-97c6aef83a98/43447612604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48fcfef9-563b-44c7-b86b-39fa7e11cf4a/what_is_the_most_effective_mosquito_zapper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b837b211-7158-4935-8a36-0411fdedb6b7/price_of_bitcoin_in_dollars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa2c61c-2f02-444c-ab67-6043c1194fbb/lista_de_100_verbos_irregulares_em_ingles.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_0b4d7d5135aa4da5bc90a8307be6484b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8c52a0-c2cd-4797-a638-b13e22b5cce0/wulomuxubom.pdfIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_336bce4dca074f22a201014a9adce409.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_dfe32493e227465fabcd010f24473ce3.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_04ff89ecf6bf4d939d9e4e5760ff0d6e.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_off0002a9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A9BD 5948 bytes
SHA-256: 3a0ff6b1cda585ccb816d452a39a08a7a082a5dec0fe97c52c58f5e8f1437691
font_01_sfnt_off0002be12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BE12 12768 bytes
SHA-256: 860916d6e2a6f9853d4142f4c2447517a47174c7f5db898d0ea0e68cc15a6218