Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8a5f51ecc567aa…

MALICIOUS

PDF

76.8 KB Created: 2020-11-22 12:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b69171a4fd99c7bb2639024400f0ff6e SHA-1: 0afcd88f45ddee8d59f9e18916dced9b54d6519f SHA-256: 9e8a5f51ecc567aa9dc871a251677dc62f8195b7bd7d0ba92815e5ae1c93ae1b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains including weebly.com and f-static.net. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest a link farm or SEO poisoning attack, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=rivers+in+spain+ks2 PDF link annotation
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/maruzok-motonanejo-lesugaditi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5f8b0a0adde19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5fb29b433d7c6.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/1314851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fad215d6d685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5fb4edf31d1f1.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/difelubujaxaxovisago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f923c3f4d97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5fa42bdb5e830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f9722372e52a.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/jijumupade/arms_warrior_pvp_guide_8.1.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c44a767-7524-41de-b3b0-3501900002ab/mejizu.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 5044 bytes
SHA-256: c836f1233213a304ef303b0a455118f0e53cbbef13bd04fe67af3e0cfc386bb5
font_01_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 12768 bytes
SHA-256: af771df222be69c9d5423eb0473c7fb884fe10830c23f82db93df3e7eb46b16b

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