Malicious PDF — malware analysis report

Static analysis result for SHA-256 a203a188225f0166…

MALICIOUS

PDF

99.0 KB Created: 2021-02-17 16:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a8c843e67b317b14764484453f24c9aa SHA-1: b1dc13a11a86f0bf64b2dc81d8ed8305cf14ea44 SHA-256: a203a188225f0166171bd611b0c007fa824d448b9f3d891d8fde540746403672
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, with one specifically designed as a redirector for a phishing lure related to the pyramids of Khufu. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links to disposable domains suggests a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=what+is+the+pyramid+of+khufu+made+out+of PDF link annotation
    • https://cdn.sqhk.co/temirikuji/jehdgge/fowekemigiwekikuzuxalupar.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/SifgicI/91385188770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_601868189ce03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fd5fe811f670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5febe171d2229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_600fe50ec4ba0.pdfIn PDF document text
    • http://idealicaitalia.website/28517122724fhbhp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukedofabi.epizy.com/guided_reading_level_for_dork_diaries.pdfIn PDF document text
    • http://ninukak.epizy.com/english_course_online_free.pdfIn PDF document text
    • http://xinasewaja.epizy.com/linorewawivijededulugus.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/pigigusu.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/pet_kam_karne_ke_upay_video.pdfIn PDF document text
    • http://wiwawilif.epizy.com/lewadosazoma.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_off000143f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 5428 bytes
SHA-256: 1f4fd7bb39ec970b08b7b843a7d4e869de95adcd4b8918e2b179dca08b998141
font_01_sfnt_off00015652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15652 12240 bytes
SHA-256: 006b2e45f5ecbbab63a8cff4cb36c0a65d15a2dd421084c8c94a78407281a9d4

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