Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33895f829e51d6d…

MALICIOUS

PDF

70.3 KB Created: 2021-02-28 12:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: d5c0ed043873a2d58a3fe2c3363541e4 SHA-1: 7ab3be396b0b121043f6533bcaf8f9260aff16ca SHA-256: b33895f829e51d6d3a53e5b4a590096720bb63a3566f04e047181cd239b83d46
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=aircraft+mechanic+course+philippines PDF link annotation
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/5fe6685f978e60.pdfIn PDF document text
    • https://wofefewivesupas.weebly.com/uploads/1/3/5/9/135957376/vekin-wuvudora-mupilek.pdfIn PDF document text
    • https://vikumufum.weebly.com/uploads/1/3/1/3/131398575/3833546.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/4296763.pdfIn PDF document text
    • https://wugizagopa.weebly.com/uploads/1/3/5/3/135311922/zosofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_6033465fc8f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_601fcff4011ba.pdfIn PDF document text
    • http://4d-5d.com/renugafenutatirabowajevu39ejq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_60218fd945fa2.pdfIn PDF document text
    • https://timifuxi.weebly.com/uploads/1/3/4/6/134676324/8193685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fda2fcaeb10e.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/sasufufa/javapekosagupojaxej.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/english_teaching_books_online_free.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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 5244 bytes
SHA-256: b016a4c5adb499b62032efd9511abc7d765c4676b245ba587eee10e872a5b515
font_01_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 10172 bytes
SHA-256: d250979fc7ea95b476bcb5a5e6388f42158573ae9171a55f77e7376bf1bc4086