Malicious PDF — malware analysis report

Static analysis result for SHA-256 177eabeee8243c5a…

MALICIOUS

PDF

75.5 KB Created: 2020-12-06 10:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 888b60090f20c6e55d8cdf1062d9ab10 SHA-1: d54f06de7c14ce0ef1ec6119a7513593c6c6632e SHA-256: 177eabeee8243c5ad41864b44bbf5d5b6f356c0668c2b14d16f9625eeb5d9aeb
186 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier. It contains a significant number of external links, indicating a potential link farm or phishing attempt. The presence of embedded URLs and the overall structure suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=basic+software+developer+interview+questions+and+answers
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/211bffe6.pdf
    • https://basafokadu.weebly.com/uploads/1/3/4/7/134706648/507458.pdf
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/panupi_nixemunaxikel_vovamalepan_sabelinobadudit.pdf
    • https://wojasatog.weebly.com/uploads/1/3/4/7/134765175/wozubapigidepi_kirukor.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/024c5.pdf
    • https://vumusubivabup.weebly.com/uploads/1/3/4/4/134491869/3640892.pdf
    • https://wetuwisiw.weebly.com/uploads/1/3/4/4/134495793/1610207.pdf
    • https://tapuroxoj.weebly.com/uploads/1/3/4/5/134599682/bupuvidovuzig.pdf
    • https://fojogozad.weebly.com/uploads/1/3/4/7/134704798/xufagurom.pdf
    • https://wanizirutakel.weebly.com/uploads/1/3/4/6/134678241/nibulufixapuferaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gadumagabusodel/16371081770.pdf
    • https://uploads.strikinglycdn.com/files/fc45dd3a-dc94-442c-8f9c-5c9550cf1b40/percy_jackson_and_the_olympians_the_ultimate_guide_weebly.pdf
    • https://uploads.strikinglycdn.com/files/e1ed21dd-a3a6-49e4-ac30-6960ee343907/68028874602.pdf
    • https://s3.amazonaws.com/nijosinizo/82932679419.pdf
    • https://static1.squarespace.com/static/5fc0e5b8a3bf4b14aba92f9c/t/5fc9e864887b444c61592e7a/1607067750415/dead_city_zombie_shooting_mod_apk.pdf
    • https://static1.squarespace.com/static/5fc565e860f2895dc105f20e/t/5fcb580364036b61438bc127/1607161860380/balzac_paris_hotel.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_off0000eaa1.bin
2c6405ac54e9f76ddcb35a01841d647b01e4efc907f30fd3ba286775272e3b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 5476 bytes
font_01_sfnt_off0000fd69.bin
88bb557a212345863133e95a97866e96bb0b3a3b1458e5c94f6d2c5bcbe7c7a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 10236 bytes

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