Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a05b9c64dd792d5…

MALICIOUS

PDF

79.2 KB Created: 2021-02-24 07:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9f37fe2ffd0cfb427b16dfedd6147d20 SHA-1: 5ab3a8c24f32c03b9bb7babd7b6a2c93513061e5 SHA-256: 0a05b9c64dd792d51e2650733536584d936ef271fffaa4902d91bd1ab2037f56
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to contain metadata related to a service manual, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/aws?utm_term=2011+subaru+impreza+wrx+service+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485436/normal_6001a1048d65a.pdfIn PDF document text
    • https://mateboxabivof.weebly.com/uploads/1/3/4/7/134763458/8924216.pdfIn PDF document text
    • http://itdomen.fun/corridas_gay_gratis_videoswzjro.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/n2hfejg/rc_drone_flight_simulator_3d_mod_apk.pdfIn PDF document text
    • https://gizunujidibe.weebly.com/uploads/1/3/0/8/130814387/9331730.pdfIn PDF document text
    • https://cdn.sqhk.co/lolitubafo/gQgjIBC/car_parking_simulator_2020_mod_apk.pdfIn PDF document text
    • https://numokafi.weebly.com/uploads/1/3/2/6/132695525/guseje.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/7256140.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/01157ce1.pdfIn PDF document text
    • http://smartycredit.info/49547277583cwwb2.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/cc240e77.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/8522219.pdfIn PDF document text
    • http://dragonflysagewellness.com/libro_victoria_primero_primaria6vaaa.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/bojukan_gizavoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 5720 bytes
SHA-256: a7c205aa56d33c63100d6e3a463585e96d7e667a1c1bee39efcc0bccdaff42fa
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 11096 bytes
SHA-256: 2db0b2fad3438841eb5db8281fe02ec24e54534d2904ab417a44dbe4dd1502a4

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