Malicious PDF — malware analysis report

Static analysis result for SHA-256 430e4e3c805c2940…

MALICIOUS

PDF

77.0 KB Created: 2021-03-03 00:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7e889fe0c254769acef2f53ebffdf05f SHA-1: d5f9080aaf72330ce8d774f039c927acf44098a3 SHA-256: 430e4e3c805c294000a48cca7d0588e073995edec63fefea5e77b21356adb5a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the sheer volume of outbound links suggests a coordinated effort to redirect users to potentially harmful content.

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://leonvi.ru/strik?utm_term=onn+cd+player+radio PDF link annotation
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/rifubowalupati.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/5995486.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/61255571655.pdfIn PDF document text
    • https://fifiruzi.weebly.com/uploads/1/3/0/7/130775727/9045412.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/1763021.pdfIn PDF document text
    • https://fomilapemarujan.weebly.com/uploads/1/3/0/8/130814088/rujuzuxaku_pawuge_xulakoled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fdbe5db6da4e.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/46628441068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502500/normal_5fe0d6b980886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370319/normal_60035d62b4fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_603813023bd95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375891/normal_5fdd9a2add059.pdfIn PDF document text
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/8bf9fe98037e354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_60307f5f76321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5fe2c8958ac7f.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/329170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fd876331b434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_60127134c780b.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 4728 bytes
SHA-256: 620324f3eb102c78522efa8e3c925324599801f58735dcf641164cb62702ed83
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10716 bytes
SHA-256: 5ebc77da4db368b48e36d53ec777ae019ffcedbb79ab36c26a06c4849c23df1d
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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