Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e402e637e4bc28…

MALICIOUS

PDF

104.3 KB Created: 2021-02-15 19:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4b231147c5491b86da2d475488291c97 SHA-1: fe19f5810ea6a1ff2c613beab2600b2339eecda7 SHA-256: c1e402e637e4bc28e31698892e7679c4c3e5f277761cd7fdeffd866ab022776e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though partially corrupted, appears to be a lure related to book searches, designed to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=list+tom+clancy+books+chronological+order PDF link annotation
    • http://site-shop.xyz/yugioh_over_the_nexusea908.pdfIn PDF document text
    • https://cdn.sqhk.co/kemivabesu/ujcjiuK/artillery_shell_fireworks_wholesale_near_me.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/kavisexa.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/JMifhfk/cool_trickshot_ideas_fortnite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497353/normal_5ffa648b4650d.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/jcWWge6/78474012130.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/eCjiMjh/visit_florida_keys.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/ijlPidz/hit_tha_roof_testo_traduzione_speed_gang.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/sojebelevenex/meeting_compliance_reporting_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/appareil_urinaire_de_l_homme.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/bye_bye_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/popopufuluv.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/42776917201.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001644d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1644D 27016 bytes
SHA-256: 6db56a8c3056fd3349f88c7fd1076e599382f90de7aac5bb7cf7ba145a50e355
font_00_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 5600 bytes
SHA-256: c195405d832eedd4b229e0149e8800d2906405ab35e8b18c585a92439a519b24
font_01_sfnt_off00013ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBC 11100 bytes
SHA-256: 558457e724abc8976ee2d2b2d302186d7e72a2c77e0df090f38668858377b3b5

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