Malicious PDF — malware analysis report

Static analysis result for SHA-256 d476fe4f92421261…

MALICIOUS

PDF

70.8 KB Created: 2021-01-10 10:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee5478e8721d86d1e31d9336c10ab164 SHA-1: edd0071852e0dd4c3a722016374ca59ea1306db2 SHA-256: d476fe4f92421261cc9028b0aa096350a8b6663e29293fbb21ce4774bbfbfdfe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 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://traffking.ru/123?utm_term=ib+biology+study+guide+andrew+allott+pdf+download PDF link annotation
    • https://site-1173627.mozfiles.com/files/1173627/video_despicable_me_4_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/hfdihgc/peraxovozewowuxekamu.pdfIn PDF document text
    • https://site-1172340.mozfiles.com/files/1172340/kibakodolavubimefoz.pdfIn PDF document text
    • https://site-1176827.mozfiles.com/files/1176827/best_simple_shopping_list_app_android.pdfIn PDF document text
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/wipaxivefo-bubalese-xodexut-vitisaf.pdfIn PDF document text
    • https://jesufapupu.weebly.com/uploads/1/3/4/7/134764637/24a538243d79afc.pdfIn PDF document text
    • https://site-1168346.mozfiles.com/files/1168346/android_sdk_repository_bazel.pdfIn PDF document text
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/gakimivoxitojof_mexuzaveti_giselepide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_5f92dbbbc8e8d.pdfIn PDF document text
    • https://site-1178004.mozfiles.com/files/1178004/81367190857.pdfIn PDF document text
    • https://site-1184666.mozfiles.com/files/1184666/98603657486.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 3016 bytes
SHA-256: 6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
font_01_sfnt_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 5480 bytes
SHA-256: 8d744499fbd35530e9884bacebdc7c93ad176d840570c8384c317055d6da58c2
font_02_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 13304 bytes
SHA-256: 25ae66a80b409fd9307c6a80d21768606d326b025f6b17d484ccdf78d0f4f68f

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