Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80698167cd92d58…

MALICIOUS

PDF

67.9 KB Created: 2020-12-14 15:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 455208b4766959a38ade6aa59b08428a SHA-1: 18b0ca687fe3212e4ed47cb71b010d15bf7e3107 SHA-256: f80698167cd92d58b186e1c718be41b1134034417d36ebcb7375dd8c3882db0b
126 Risk Score

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The presence of external URIs and a link farm heuristic strongly suggests the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=reverse+stockinette+stitch+in+knitting
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/kagikarujedef-babegodid-fatinurorip-mamunemo.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/lakepurisemojiwap.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/kasonelonuforuli.pdf
    • https://susominen.weebly.com/uploads/1/3/4/7/134714937/jurodugubuzu.pdf
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/pejovoletug-basajewawa-molivolopuji.pdf
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5fa6a05525118.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02fa7bb3-0c7d-4bd4-8e49-b3a3632fd292/penguin_of_madagascar_full_movie_in.pdf
    • https://s3.amazonaws.com/geraromu/business_complaint_letter_sample.pdf
    • https://uploads.strikinglycdn.com/files/d851f834-c12f-4a5a-8ea9-282979988a7e/9091430059.pdf
    • https://uploads.strikinglycdn.com/files/4c8dbbee-d3a3-4e65-b9e6-d37339558e7e/realidades_2_capitulo_4a-8_crossword_answers_page_74.pdf
    • https://uploads.strikinglycdn.com/files/93d897a9-08a5-4f5a-9819-276205452972/26455528113.pdf
    • https://s3.amazonaws.com/xanebavifamopez/carboxylic_acid_notes.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_off0000d1a7.bin
7b672392269f3414478480a975936c366dfe543df76f5e15d97e7eec00551c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 4948 bytes
font_01_sfnt_off0000e289.bin
2e9a737d37f1eb3ff04c0e409bd9557f5ed3921889a21fd71afcfe7f0d1dabe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 9484 bytes

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