Malicious PDF — malware analysis report

Static analysis result for SHA-256 914b6b5abac782b3…

MALICIOUS

PDF

83.4 KB Created: 2021-02-17 18:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f0fd261af793081021df1dafa63ca3f7 SHA-1: 7ff4d350be217902a8193fb85874cf229fb31f5a SHA-256: 914b6b5abac782b3e65601d3f3fef47586856dc948b58056ec97c22824933134
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 pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests a malicious intent to redirect users to potentially harmful content or phishing 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://baarspo.ru/strik?utm_term=immanuel+kant+on+enlightenment+sparknotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391621/normal_6025df03a6714.pdfIn PDF document text
    • http://wigogaduxatinuv.iblogger.org/48471125299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_60166bf6ef971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_601a75e0135bf.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/fkfbzhh/rugby_champions_19_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/rChbSia/12738833241.pdfIn PDF document text
    • http://dfwshootersupply.com/73373976792k6lb9.pdfIn PDF document text
    • https://xitetufiwirisax.weebly.com/uploads/1/3/4/0/134041449/3418201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_601fca1c71b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_5fd78208a43fd.pdfIn PDF document text
    • http://chelobaka.space/noxowaw2973.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/0b67cd330.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/eeabe931.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafuzivega/ggrggjc/water_park_fun_water_slides_in_texas.pdfIn PDF document text
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/pixejeda_fipukevupavop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 5232 bytes
SHA-256: 2e496ab35b2d854fb129bd4fc010f166ece9ee81b4a217566110bcba73f76214
font_01_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 11596 bytes
SHA-256: e29859b5bc787d0143b28ddac5e9dc9b8f90dca6fa3113c4a49c5ce8e642f2ed

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