Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1130f2cec8755d7…

MALICIOUS

PDF

77.9 KB Created: 2021-03-08 06:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aac53725617238426ebde562f68ab50d SHA-1: 5ddc39cb9baf8d885064f1d364d5dee346914522 SHA-256: b1130f2cec8755d7993a8c9dc55586a6ad298c212754caeb93b07a6806175a4a
146 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. 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 0.9997

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 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://bologen.ru/aws?utm_term=what+time+does+ms+dmv+open+on+saturday PDF link annotation
    • http://wepovak.iblogger.org/android_blowfish_encryption_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6041646f5bbeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_6007502920834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_603a16d6c6d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_6043852900af8.pdfIn PDF document text
    • http://kikotukujumosif.iblogger.org/how_do_you_use_a_fluke_62_max_ir_thermometer.pdfIn PDF document text
    • http://xosijitede.22web.org/poligegupamafosil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_93276da04b2c460fb030a034deeaf6a7.pdf?index=trueIn PDF document text
    • http://potufepevumu.rf.gd/34608002858.pdfIn PDF document text
    • http://kosirokuki.epizy.com/14284044515.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_c6017b470ed2467d9aad17a8a959be72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e192e507-749e-4d09-a994-96722bef8fc8/97200671044.pdfIn PDF document text
    • http://pupovedifa.rf.gd/43431766014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58ccf3a-8510-4083-a998-ed4f7c8361e3/bivibodigumami.pdfIn PDF document text
    • http://rukiladat.rf.gd/nifedewilatataxevoni.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_8576e46007e14ff4b4c7ec065741071d.pdf?index=trueIn PDF document text
    • http://xasitotimokines.rf.gd/lg_waveforce_error_code_oe.pdfIn PDF document text
    • http://zerinamud.rf.gd/what_is_a_interpersonal_communication_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5b011a-5aa7-4401-b11b-5a5d48d82938/how_to_install_nuance_dragon_naturallyspeaking_13.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_18d13484d06341d09bbf9732a33a7bba.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_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 5340 bytes
SHA-256: 47f9be95f945b7ff5bd3b2798f8f2b3187b57e24839b93ac8f7e8eb55df2c31a
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10532 bytes
SHA-256: 9dbd78ddaa83e818bee74170f740149d8a2af5fbef51e7e0f6c806345456741b

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