Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab31c56c68d3815b…

MALICIOUS

PDF

79.2 KB Created: 2021-04-03 05:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fe9b50b51c987f21509add254a393108 SHA-1: 00d3435ec89a0c83fb3423e70b9cf0625b14568e SHA-256: ab31c56c68d3815b6e351a84eae54366f43dfbe5db94b393be8fffc26e2a31eb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on redirecting users to potentially malicious sites. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The document body, though heavily obfuscated, contains keywords related to watch faces, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/123?utm_term=android+wear+watch+faces+on+gear+s3 PDF link annotation
    • https://zuzunavodezap.weebly.com/uploads/1/3/0/7/130776081/6768562.pdfIn PDF document text
    • http://fenarumobajixu.22web.org/aa_12_steps_and_12_traditions_audio.pdfIn PDF document text
    • http://golomashvanna.xyz/756606432273dh05.pdfIn PDF document text
    • http://trylait.pro/silver_eyeshadow_makeup_tutorial_smokeyyqyed.pdfIn PDF document text
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/8015555.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/9781304.pdfIn PDF document text
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/fegodoxukelorekoj.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/jeworurowam/zoxavedunobene.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/mailer_design_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/angle_relationships_pyramid_puzzle_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/25342971893.pdfIn PDF document text
    • http://vurasoda.rf.gd/16489187293.pdfIn PDF document text
    • http://zutaturusix.myartsonline.com/tegiriku.pdfIn PDF document text
    • http://fozozip.onlinewebshop.net/11155873882.pdfIn PDF document text
    • http://tonubugiloroluv.rf.gd/ansi_c_programming_language_download.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/wewofubedetililexenaj.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 5496 bytes
SHA-256: 0019c6c379ed3d74c0210eb8badc2d5958744ad0f0f3ff6d326930a2245d7f80
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 11156 bytes
SHA-256: 8518193eea1888037073c346178f3c39a340527ea96bef597ce6661fdff91c9e

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