Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7587127b1f4a3d…

MALICIOUS

PDF

80.4 KB Created: 2020-11-19 00:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ed638716fbff22ba09ae1cde838841a7 SHA-1: d84443df3ab774607e6960ec3c1711d3df2863f2 SHA-256: 3a7587127b1f4a3d81c11beef33a7444adc28d8e211bba79e90448e8d15a3082
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 0.9997

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 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://trafficel.ru/123?utm_term=road+king+fairing+with+gps PDF link annotation
    • https://sowofinonapira.weebly.com/uploads/1/3/4/3/134361296/wisabuf_jofavazasiguw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5f99df290b3cc.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/bofax-momepunewi-fovilugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5fa7b910a214d.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/08d5bb109.pdfIn PDF document text
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/1633251.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/2949381.pdfIn PDF document text
    • https://jobexevufurol.weebly.com/uploads/1/3/4/5/134526996/fanolu.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/32b4c1df-664e-40f2-aaa3-83fbdfac9fa9/51367260728.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/digital_collage_art.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/kosidi.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/fizebajobogekuritu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/3905315548.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 5104 bytes
SHA-256: c9434a8b24c36c4abb7504bf2acecc8b4c75637f1538bff24494963dc6968ad5
font_01_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 12144 bytes
SHA-256: 23f48174d2c86444cb1bf4337374f42ccfd3a79ba679dd2f5cea6873023d91f6
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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