Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a8d338673f4a52…

MALICIOUS

PDF

71.9 KB Created: 2021-01-08 18:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e77910c80c2b49d270ab6b375ba52bd SHA-1: da7da4f548b5218baa27db62f327a1697dfd6749 SHA-256: b8a8d338673f4a52925faca0621e0cbe02416967b9ff5ed930f1e7407eab7fcb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, contains text related to a game guide, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffnew.ru/aws?utm_term=dragon+age+inquisition+quests+guide
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdf
    • https://ziwobusomuka.weebly.com/uploads/1/3/1/6/131607005/c3492154793c16.pdf
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/rekarariv.pdf
    • https://cdn.sqhk.co/zewezerezi/VjJPjhj/classic_car_parts_auction_uk.pdf
    • https://wovufimi.weebly.com/uploads/1/3/5/3/135327312/9938069.pdf
    • https://cdn.sqhk.co/mekekomubun/JzgdGji/sirocco_yacht_captain.pdf
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/bc63ddfea5e0.pdf
    • https://tumegifokax.weebly.com/uploads/1/3/4/2/134235775/8867655.pdf
    • https://waretufiwad.weebly.com/uploads/1/3/4/5/134581883/pedepasugexajubejul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/taturi/59381455144.pdf
    • https://uploads.strikinglycdn.com/files/5c26988b-b945-47a9-9f02-87e0e11ee010/age_of_empires_castle_siege_offline_apk.pdf
    • https://s3.amazonaws.com/vutame/73017870813.pdf
    • https://uploads.strikinglycdn.com/files/c4c983f1-ec98-4b77-ad87-2657060ce1f3/timesufilupubenevifi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0b.bin
a966b18b6401c974c012c0c5f1205ac951399303dfaccf86cae12f8aa4eae2d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 5088 bytes
font_01_sfnt_off0000f05d.bin
236abc8f6c25932c04e619b48876a4247d499347656a9120b6956edc59ce0e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 10020 bytes

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