Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f9e1fe54502a63…

MALICIOUS

PDF

81.3 KB Created: 2021-01-26 09:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 89c9d645e2e85a35525f6cf5bf9120da SHA-1: cc41f6136f00ac3f14e7e8f3eb1e163f373149c0 SHA-256: 63f9e1fe54502a6372fec0d9ded4137cda5367c087e2915973a1953b46a760d8
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious websites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document's structure and embedded URLs suggest it is used as a lure, likely for phishing or to distribute further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/123?utm_term=how+many+ounces+does+a+red+solo+cup PDF link annotation
    • https://cdn.sqhk.co/rilixuzewiv/rrjgZlo/siforaziluj.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/iEiiihm/cars_vs_cops_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5fe409dd30625.pdfIn PDF document text
    • http://jotijitod.66ghz.com/australian_super_performance_figures.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/XpMhcRf/idle_apocalypse_replay_events.pdfIn PDF document text
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/812861.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/OrOhfWN/playne_the_meditation_game_android.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/8765445.pdfIn PDF document text
    • http://dunetetemob.22web.org/independent_examiners_report_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/digibje/37250020945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5ffc917140e37.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/sowirutelevolur/4871408305.pdfIn PDF document text
    • http://tifureboriva.epizy.com/inspection_report_format_for_garments.pdfIn PDF document text
    • http://junedujivoxoz.epizy.com/march_madness_bracket_blank_template.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 5376 bytes
SHA-256: e43e962795c592f704a78c15f4fe6cbdaafd384acc1cf392734b9918e486daa5
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 11808 bytes
SHA-256: 7094702d83cbc887909c3189613c2c6131be94ab1f6760784d84c5f16533e019
font_03_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16068 bytes
SHA-256: b1615e29a4fe6c7320d553a30418b4fece26933a192be804fa4a6c1955e67a67