Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f477d77cd213240…

MALICIOUS

PDF

65.4 KB Created: 2020-11-13 06:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3fed4544cdabef153933e24a2026ed8e SHA-1: d93af9db4c4ce1a5c3cd9a2c81408b3148a1f385 SHA-256: 8f477d77cd21324044934a24ba24c20593150d9b68e07a4beb7b30e9b2f7eafc
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-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.
  • 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://traffset.ru/123?utm_term=mulready+elementary+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406191/normal_5fac60c61fc15.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/3222a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f8d6e6ac95af.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/4f559dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_5f99b46fe7805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_5fa4bc3460869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f9efc6242d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fa8fe2e9bd80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_5f92ab9522b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fad5f2c3d9fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5f93e97615599.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/xebuvuwov/colorado_unemployment_insurance_quarterly_report_adjustment.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/verb_subject_agreement_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/69391070231.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/vigifamitog.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/tugovogobo.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_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 5284 bytes
SHA-256: 9d96e801055448d9edc69f5c434e5aa06fca06e0fd873b25f65d1360909782e2
font_01_sfnt_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 11768 bytes
SHA-256: c0a08268a9c46b1e62a1d68bd9afd92cd1518dc435857d97beb0d637d350ed01

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