Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aaa760a3bdc1af…

MALICIOUS

PDF

77.2 KB Created: 2021-03-16 23:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50c6ce75cec4e33990aef12201555fb3 SHA-1: ceb61e250ee2bd5ec7449fd6354d36ad70691c3c SHA-256: d3aaa760a3bdc1afd0d5d7395cdd949a26e0d035fda9f04e0586c80f51a6dedc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=how+to+take+lay+z+spa+pump+apart
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/6b5878fb5669d3.pdf
    • https://cdn.sqhk.co/jizuxadif/czRgjgi/bebaboluvabinabu.pdf
    • https://cdn.sqhk.co/fakomuse/chYWigJ/dujelubiwapivibitoxolo.pdf
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/2048599.pdf
    • https://tesazovefikuk.weebly.com/uploads/1/3/1/4/131408970/966735b5d574c.pdf
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/taxezigibetuvif.pdf
    • https://cdn.sqhk.co/putizimetiwe/bHUvgcY/2020_football_season_start_date.pdf
    • https://cdn.sqhk.co/junikesiza/djjFaij/recarga_amigo_sin_limite_200.pdf
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/a1af3.pdf
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/7917127.pdf
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/7406146.pdf
    • https://vidasukesidi.weebly.com/uploads/1/3/4/7/134731400/5b27fb0701dbbe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxegezivumi/39745747739.pdf
    • https://s3.amazonaws.com/dazuxujepov/is_baldurs_gate_1_worth_playing.pdf
    • https://s3.amazonaws.com/daxemo/15626719778.pdf
    • https://s3.amazonaws.com/pazerogasarinu/croatia_travel_guide_islands.pdf
    • https://s3.amazonaws.com/jedaxopopuko/wadogenazufosarojowizebaw.pdf
    • https://s3.amazonaws.com/fadupazageraf/12357386923.pdf
    • https://s3.amazonaws.com/gonima/acls_advanced_cardiac_life_support.pdf
    • https://s3.amazonaws.com/dotivaf/vugofedotaloxomejakavig.pdf
    • https://s3.amazonaws.com/tikoweravisixu/fizesidedexejibatu.pdf
    • https://s3.amazonaws.com/xoguwavosuje/superantispyware_app_for_android.pdf
    • https://s3.amazonaws.com/kudowo/bmw_e46_auto_to_manual_coding.pdf
    • https://s3.amazonaws.com/mamukawaxatali/annual_report_cibc_2017.pdf
    • https://s3.amazonaws.com/pezofut/formato_anamnesis_veterinaria.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_off0000f302.bin
0e0f80bd6d23c63ad7d587b72e07a7c08aa46ae8ba95ad79d057323a61ccaa8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 5236 bytes
font_01_sfnt_off000104dc.bin
72b86376142df44479d54822bcf10a4d8427d0d62beabe64404a29818a9f0aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10048 bytes

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