Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a645983e39b9c23…

MALICIOUS

PDF

67.7 KB Created: 2021-01-12 14:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bdd806d06bf21ca841f56cc885a8391d SHA-1: 56f96edcc0abd5947ed21540af113c64a2f61f6e SHA-256: 4a645983e39b9c23d53f61bd7dfa5300bbfadfad4cc4047a4eb311525712a833
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, and the document body was heavily obfuscated, but the heuristic firings clearly point to a malicious link distribution pattern.

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://traffine.ru/aws?utm_term=baseball+uniforms+jersey+cheap PDF link annotation
    • https://bibitoxi.weebly.com/uploads/1/3/4/6/134653780/7041136.pdfIn PDF document text
    • https://site-1177918.mozfiles.com/files/1177918/jivarigalupuw.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/jepigupivewezi_mikurorefajexi_ruzesenazoxasa.pdfIn PDF document text
    • https://site-1177775.mozfiles.com/files/1177775/kosepemapol.pdfIn PDF document text
    • https://site-1168260.mozfiles.com/files/1168260/nujudosoziterarifesuk.pdfIn PDF document text
    • https://nuravodabola.weebly.com/uploads/1/3/0/7/130740537/5435478.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/8137780.pdfIn PDF document text
    • https://xuzufudoroxibu.weebly.com/uploads/1/3/4/7/134755415/6321747.pdfIn PDF document text
    • https://filewefoxu.weebly.com/uploads/1/3/4/7/134750201/2072872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_5fb4bca0a4043.pdfIn PDF document text
    • https://site-1177815.mozfiles.com/files/1177815/lajibu.pdfIn PDF document text
    • https://defusisiz.weebly.com/uploads/1/3/4/5/134599350/vuzewovavevizefema.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/3562284.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/365214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/jezilanaraxaleno.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 5624 bytes
SHA-256: 6bcd9a9ea49b4873224f1b0adbed30dd9733247058b0007505203a156a4f1ef9
font_01_sfnt_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 11204 bytes
SHA-256: fa13ae74822b16049c293dede0d891973dae9e6b905e19d5f6135c3036debe63

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