Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c79980d37abf34…

MALICIOUS

PDF

83.5 KB Created: 2021-01-03 23:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fba1322f7150d7abfb4ba9c847d7989e SHA-1: 25ce0383b262a37beeec3ddb8415d53d36e1178b SHA-256: 29c79980d37abf34412fe1519bd0551d324be49032f100ad1d7567c24be72386
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 contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

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=mutated+zygomites+osrs+slayer+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fb38abf877e7.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/satakiwud.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/bemapapimat-poruniduvoro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485799/normal_5fc3eed57eb7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fad97f71838a.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/ijjTyV8/real_drum_electronic_drum_set.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/6c71d084efb03.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/SgiifS2/bumper_stickers_for_cars_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fc94f5271979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fb743908ec60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f9fbf8c67a15.pdfIn PDF document text
    • https://jasuxazej.weebly.com/uploads/1/3/4/8/134875243/dbd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_5fadc9aa2a935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412607/normal_5fddcd279df45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21eccef3-cfb9-430d-a8f3-15b5b7ecbb23/bafuwanixumejubotonepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc8792c-70af-46f9-a125-313d8d8ed239/zizulisal.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_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 5300 bytes
SHA-256: e3051d4523a72e63cdaa477727cf24212bd13502aec37256ba4366b32aad864d
font_01_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 10748 bytes
SHA-256: e6281705d0fa6af56dbf23f38873bf2992884404c50880253c2b0db4ff5679d4

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