Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccead526b033080d…

MALICIOUS

PDF

84.3 KB Created: 2020-12-26 16:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ac861d4e7298519ca048ae66face728f SHA-1: ba4f6741018de50c9cbce86837d20bc7283d866e SHA-256: ccead526b033080d8c2e7ca3dd040b0b0b596eed4841fa9196a2b0e84f7c5002
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafffi.ru/strik?utm_term=thinking+skills+assessment+oxford+past+papers', appears to be a lure, potentially directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=thinking+skills+assessment+oxford+past+papers PDF link annotation
    • https://cdn.sqhk.co/zupuguvawaj/hg3Sjdf/wosixefixawo.pdfIn PDF document text
    • https://cdn.sqhk.co/joxufejod/Tk6a8TE/zasewar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5fb9ba1a3eed5.pdfIn PDF document text
    • https://sujexixapobitu.weebly.com/uploads/1/3/4/3/134328704/e82ee41c6f0.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/Igifjea/doom_movies_in_order.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/bdf5cfb3bef1c.pdfIn PDF document text
    • https://cdn.sqhk.co/nerutamar/c6ijwgc/69913887991.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/jlMiist/49706674544.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/ichjXgi/los_juegos_de_ps4_son_compatibles_con_ps5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5fad975cf3b8b.pdfIn PDF document text
    • https://modudipagif.weebly.com/uploads/1/3/4/6/134688888/0f8358510.pdfIn PDF document text
    • https://cdn.sqhk.co/lerotakisisa/Ez1uieo/katir.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/sekedovif_rukugar_mezekutoponur_lavirineko.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_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 5324 bytes
SHA-256: 5a62445e51c0f91c31928516719105cfb3b8693585c39573cdc4a19448f11e18
font_01_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 10936 bytes
SHA-256: 8ce104a3ed10833c433d2b275040cf5eda91849aad1348e07252c2dbe0a3e3a7
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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