Malicious PDF — malware analysis report

Static analysis result for SHA-256 e397c1593d118aa1…

MALICIOUS

PDF

73.3 KB Created: 2020-12-15 22:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8be6fb7cc4a6342fd506218e8c516453 SHA-1: bbfcc94f3b7555667ef51be1a3ee8bd25035577f SHA-256: e397c1593d118aa18bbe847e0b723a794dc36a026e8d6c9a4067eca8eba26255
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a heuristic firing for a link farm with numerous external PDF links. One of the primary URLs, 'https://traffnew.ru/strik?utm_term=tabe+answer+key', is flagged as unknown reputation and is likely the malicious destination. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. No scripts were extracted, but the presence of multiple external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=tabe+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5fada6f6e24e4.pdfIn PDF document text
    • https://rigawolazi.weebly.com/uploads/1/3/4/7/134710531/2f2b8.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/3620d6b1ca9c.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/13456dfc-0f80-4130-ad8a-3f3f341a7aa8/kafujafo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd308239b0722912b0841/t/5fc2430d61e25426e18272be/1606566670511/table_of_integrals_series_and_products.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4dd68b-089c-4891-bba6-810b401d19ce/65172194357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5b67db-7707-4362-8052-2bfcdcb42cd6/88776589710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da274e6-8736-442c-9f03-43ab816418ff/93611967411.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe009da97599144ebdfd87/1606287518579/64774265012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46ae741-5306-4cf9-87f0-a1342b1bbbce/rogezanamis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140227f0-69cc-4667-b0de-e5d242a1c28d/viwewididelika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a082219-61f4-496a-bdb1-d713cf60b5e1/15870278012.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 4992 bytes
SHA-256: 27669b8a6add7a557ca9339f422403e90040a21ea0c3530eb2802a8f75cad8c9
font_01_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 10496 bytes
SHA-256: 3df610c45d402c1900ad5bafd50761f5e041d0dde04c0b6b1342441f2a06fb31
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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