Malicious PDF — malware analysis report

Static analysis result for SHA-256 2878449e69b986de…

MALICIOUS

PDF

74.6 KB Created: 2020-11-17 16:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 24c07956a486f3cc826cd80c17926c4d SHA-1: 309f2930365ac44cc315ba902697064197889254 SHA-256: 2878449e69b986deab696690ada432ec3450c904a7e662576dd6573940062c76
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 pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=where%2527s+waldo+pictures+printable PDF link annotation
    • https://nonikezit.weebly.com/uploads/1/3/4/3/134335915/toxomoduwan.pdfIn PDF document text
    • https://wesikuwufo.weebly.com/uploads/1/3/4/6/134647185/bejubiradadima.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/5916562b9195c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5fa2b743a0b43.pdfIn PDF document text
    • https://zagusopiv.weebly.com/uploads/1/3/4/2/134234894/83b951f.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/salubegezare.pdfIn PDF document text
    • https://rokepovel.weebly.com/uploads/1/3/4/5/134500090/5c559e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f89e9ad02005.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/gubuzibizelo_divajapudif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_5f9f7eb9c3db4.pdfIn PDF document text
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/99cbd92443e.pdfIn PDF document text
    • https://wikujodavo.weebly.com/uploads/1/3/4/6/134649345/686164.pdfIn PDF document text
    • https://fagozeku.weebly.com/uploads/1/3/4/5/134506452/d7cb8e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000d250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD250 5440 bytes
SHA-256: afd2fb9e5a7948ad58a87537283f37c4e2562ebb6f9959a80e7af893e0236f82
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 10548 bytes
SHA-256: 2a96aaffa75f368619e6f60463738c13caacfdd313ced9932c26f886ef18a6c4
font_02_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 16060 bytes
SHA-256: 0d2cf29b13ffe7e42e9984e6c191618c7dc34d08b3b68ffdc6e305960fb7475f

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