Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a63a62e8e02d92…

MALICIOUS

PDF

77.5 KB Created: 2021-03-27 16:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df8d27cebb29903c15484a868ed5ffbc SHA-1: cfc8829b6a0915c182f0a3dfd7a84834fc846336 SHA-256: a3a63a62e8e02d924d9109881a48011e49caf64f7e482f69d77ef706c9f68b7b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://pelibifir.ru/award?keyword=backgammon+professional+strategy+pdf PDF link annotation
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/guwoz-pezosunud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_60481bce3f6a8.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/mojosirumosovupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475985/normal_5fded6a4a0010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_605ef7e7b2690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5fed7b12550ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_60437186e05b6.pdfIn PDF document text
    • http://figojusu.iblogger.org/why_is_my_heat_pump_not_putting_out_heat.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/r0xFwic/interesting_facts_about_cats_eyes.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/eS7Y3ih/flower_garden_store_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5fdde88e68412.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
    • http://dutugege.epizy.com/bluetooth_driver_windows_7_free_cnet.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/42871651463.pdfIn PDF document text
    • http://kuzezoma.epizy.com/kawasexe.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/dometic_thermostat_wiring_guide.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

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_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 5480 bytes
SHA-256: 0b04751019fac55ecf6a103f9acb77ae1aad2e01b0fb59359bbb5c6527cae580
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 11272 bytes
SHA-256: 0675bdc35cbf79a57c0ac45d4cbc2353b7a57d6a27a364ea509042bab5926490
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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