Malicious PDF — malware analysis report

Static analysis result for SHA-256 28037c9fa3bbc224…

MALICIOUS

PDF

79.7 KB Created: 2021-04-03 09:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 626763bc7dc0c6b4745385ef9da6fbc2 SHA-1: cec3a91396c28e957c28118cef8aaf5aaee284f8 SHA-256: 28037c9fa3bbc224f502d0422f1818477a7fb1bbf5c0c1905c3ceed8a8ba3ce8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=diablo+3+ps4+local+and+online+co+op PDF link annotation
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/mutobodoziw.pdfIn PDF document text
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/duzitivuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fd9754c21617.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/dibenefudomu.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/5558244.pdfIn PDF document text
    • https://zusonugen.weebly.com/uploads/1/3/5/3/135305237/roreduzatewov_wadarun_zuronaniwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fcd56f95a813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fe49d9b4abbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fe4b4d9698b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b260377-8898-4ecb-a187-5472559ee7ac/lolizebuxusexad.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/beautiful_butterfly_wallpapers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/antigone_guide_oedipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a60039-f731-48c7-806a-8910ac1ea148/8195482768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04a86ba-73d5-4e69-9337-08f2cc58b367/memento_mori_meaning_english.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/how_long_do_smoke_detector_batteries_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58038ebe-789b-4fd4-8844-73a893f9de0a/519124176.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/karajotiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0756d726-6497-4895-8942-9c728abb57f2/zokiverowilozisux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88eb4afb-e4b2-408e-95a4-f0bc62b5b4c2/is_organic_chemistry_2_required_for_medical_school.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/pufivomixolotonofofemomeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19edb2f-3ee9-4668-a0e0-4812cb89e6aa/introduction_to_computers_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b118e83-703f-46e6-8cd9-ccd6a23ce71a/lobovibonobaxotisurur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10de16bd-d20a-45f7-8f96-2a24a995c283/94393101384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5459410d-db6f-4fa6-bf58-591eec450593/what_is_a_relapse_prevention_plan_mental_health.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 5360 bytes
SHA-256: a5fbef73209841a572492eb5ccdc24c75ce7a612c100ddf61f1849fdf78ef7d8
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 11172 bytes
SHA-256: cff0e60e6662dadfa8985b8998c04a7e3d57c1464fa1645eaa4d6c7b4d8bcc0f

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