Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3fbb94ed89c9c5…

MALICIOUS

PDF

71.7 KB Created: 2021-04-20 01:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7a6c1d0c9aa6900b2a01c9395267795c SHA-1: b303b836685e871e80858276ecc561be3951dccf SHA-256: ad3fbb94ed89c9c50edaa938a4f1a6e4188fecdaad56b22b3b97cd04a15161b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('crophysi.ru') that appears to be part of a link farm designed to redirect users. The presence of multiple disposable hosts and UTM parameters suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://crophysi.ru/strik?utm_term=brother+ls-2125+bobbin+threading PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464070/normal_600e316f056bd.pdfIn PDF document text
    • https://putejavorem.weebly.com/uploads/1/3/6/0/136057301/0c08e.pdfIn PDF document text
    • https://gawupuvuto.weebly.com/uploads/1/3/4/5/134530234/naributibop.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/ajdY2ij/balare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_60316ec6838ff.pdfIn PDF document text
    • https://cdn.sqhk.co/digijodaga/cgeuQyo/29378823598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601a10797e43a.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/ic2DhaN/hundred_fires_3_sneak_action_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5fdfbcef58a7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480748/normal_5feeaa01aed1f.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/ghbjeig/vewirojefoket.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/physics_basic_formulas_and_units.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/pofejobogib-fojovefip-bunun-najeku.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/i4jfBjc/carne_asada_plate_nutrition_information.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/vitelitubovuluj/android_9_pie_for_oppo_f9_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/what_is_the_purpose_of_a_causal_comparative_study.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/63784595793.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 5616 bytes
SHA-256: a17f7cfb207a5739ef4e88345f34e974c87ddf0e5f7e9643daeefe207c1105c8
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 11704 bytes
SHA-256: 2f8fe6c2d0d07f09b0b1f3ac4d19a0f51955b4fd7c7a390f50b8838307ebcd98

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