Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83dd4a93896c263…

MALICIOUS

PDF

67.4 KB Created: 2020-11-14 02:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0afd0422e905e7178880c671345bb75a SHA-1: eaaffc6c4373bba67a79a6bae98d65fe1861a1da SHA-256: c83dd4a93896c2637db9727c115c4886a750c7999acea36dd39ed266f5378990
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to potentially malicious content or phishing sites.

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://trafffi.ru/aws?utm_term=history+of+muslim+civilization+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421213/normal_5f9c0729653c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_5fae0190ecd0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5faee04117024.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/bibaw.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/bcdbb714.pdfIn PDF document text
    • https://fijudemi.weebly.com/uploads/1/3/4/4/134400988/a76fa.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/9003901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f8def6079b21.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/sulamufetivekaxidut.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/tebiwugo.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/8776339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5f9467de57d21.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/5967797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_5fae9598e8c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5f9326b63e2f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 5476 bytes
SHA-256: b22fe32cdf0e969828c186bb23260e17c951b4ca2ffcd2a74d31b34725dfdc5b
font_01_sfnt_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 10804 bytes
SHA-256: 489792a6e8f888b34e8b23b41612b2a4a4a1568127c45b0fea3a15d58721caad

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