Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0eb8af4661a106…

MALICIOUS

PDF

84.4 KB Created: 2021-01-26 18:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 39b144567e7408446c98e6128af3d184 SHA-1: 0ab7510fc2bb8aea183141e3baa3c28bf0ce6ba7 SHA-256: 4c0eb8af4661a106326a14475f89ad22a9e1c1b4842582852707d19f337b87f3
156 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, identified as a link farm. The primary URL points to a domain associated with SEO manipulation. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to a network of potentially malicious or SEO-abused content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/aws?utm_term=flow+diagram+powerpoint+template PDF link annotation
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/3115345.pdfIn PDF document text
    • http://clobuss.ru/missing_411_documentary_wiki43o7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff32f0031c8f.pdfIn PDF document text
    • http://cheatyou.site/16867878838i86v5.pdfIn PDF document text
    • http://metalllift.ru/40560689142qypv9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_6007e5d0f289e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdad5c771b41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5ff3c211a5a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5fc5df8a14c49.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/pabozeses_fadeg_gupinoxun.pdfIn PDF document text
    • http://naturmilans.fun/33456935174f5a70.pdfIn PDF document text
    • https://kadeniki.weebly.com/uploads/1/3/4/0/134097858/7384267a503ac9.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/bebir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jivagajamav/java_code_formatting_in_intellij.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/irish_general_knowledge_quiz_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/85941019980.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/mivefisejuvodilami.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 4936 bytes
SHA-256: 4981b7df4fb56d348700afb176bc75c57e46612e0258ae9ff8321fe9fa60a859
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 10776 bytes
SHA-256: 67a52b996213d056969c354fc05fd259cae766bb44f01638adac519f48e536f2
font_02_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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