Malicious PDF — malware analysis report

Static analysis result for SHA-256 1100a21de9b32966…

MALICIOUS

PDF

78.7 KB Created: 2021-05-12 21:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 539f7c8501b25bfa5a08fa24549d7858 SHA-1: dd196a60ff18da5671e6fe1738d8288b84ae756c SHA-256: 1100a21de9b32966018d2cf8d3804751e88cd869122b74fd910bf426f4be947b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a tactic of redirecting users to potentially harmful sites.

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://midufefew.ru/strik?utm_term=the+bell+jar+bell+jar+quotes PDF link annotation
    • http://ontrade.top/82297759538q2bnw.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/4852618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_604e8c9604b7c.pdfIn PDF document text
    • http://huseyincanx.com/12975756897b71jd.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hhAcKjd/63335798131.pdfIn PDF document text
    • https://pusugokejetajek.weebly.com/uploads/1/3/4/7/134765622/megibilol.pdfIn PDF document text
    • http://3203epworthcres.com/jedivakuwogasavburgf.pdfIn PDF document text
    • https://laxoweveludek.weebly.com/uploads/1/3/0/9/130970009/9bd16b6927c76f0.pdfIn PDF document text
    • http://dozisozaxup.22web.org/88753567963.pdfIn PDF document text
    • https://gavizixuf.weebly.com/uploads/1/3/5/3/135334805/d2025d9828.pdfIn PDF document text
    • https://vipogonegope.weebly.com/uploads/1/3/0/9/130969266/8808897.pdfIn PDF document text
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/maxirarovaruwo-lurudigipe-mofurepa-vedawaw.pdfIn PDF document text
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/derufi.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/ehcjbib/crossy_road_disney_app_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_601f17965972e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilexijo.rf.gd/bet_method.pdfIn PDF document text
    • http://kizuwopo.epizy.com/jabotefok.pdfIn PDF document text
    • http://wafubarig.epizy.com/annamalai_university_dde_convocation_application_form.pdfIn PDF document text
    • http://fewebife.rf.gd/15521360582.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5064 bytes
SHA-256: 3c3453cb64d965d6aec858bdcf55b8c6b262e24f214cb993781976424dc9244e
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 11156 bytes
SHA-256: 4a3a1571e5537ec7725aa48facdbc0ec6d24444b9c7541af5405dc77772deb9f

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