Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f133f023f85185…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 11:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1691d9ad2e22fc783fc5692820658c35 SHA-1: eba4744877fc67efb5df424f199a0c76b18931b3 SHA-256: 36f133f023f85185a35ee5d9dac92a3501f018a52703dfc1d48c1c2155d7604b
176 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 0.9998

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 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.
  • 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/123?utm_term=anonymous+call+android PDF link annotation
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/767844.pdfIn PDF document text
    • http://famexukox.22web.org/79941312192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fcbb9807419f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_604ca503df10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_6014811b4b8a7.pdfIn PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/4636591.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/zorikep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fc8c62e6c1e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_601e43bed7406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5fee1b083707b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_60258458743ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_6017878f70741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazatuv/airflow_bashoperator_template.pdfIn PDF document text
    • http://wilesodirax.epizy.com/59033027396.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/practice_worksheet_expanding_and_condensing_logs_answers.pdfIn PDF document text
    • http://jiboleramar.epizy.com/cholamandalam_claim_form_part_a.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/c_s_p_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/12932058085.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/dazuwulitaji.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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 5176 bytes
SHA-256: 9c09ad2c946d5f25bac95243a4b6f579119b4d131eb446f7a4aaf6bc53413a78
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 11480 bytes
SHA-256: 7a87fa65d6464d86dd5a57c30359eeb09259d794edf3f6ea79a5f6896f14b0c1

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