Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd42ffd910298e4c…

MALICIOUS

PDF

70.8 KB Created: 2021-01-26 13:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 76da03f28fb79cb90b3d63ab466b4561 SHA-1: f4948923a65adb3d0a8841afbbee48b2096d96dc SHA-256: dd42ffd910298e4c39bc9f06e69d7b64e08676b1ed72dadf0945245d5308e510
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'financial accounting' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of external URIs and link farm heuristics strongly suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://traffset.ru/aws?utm_term=financial+accounting+2+questions+and+answers+pdf PDF link annotation
    • http://godomun.iblogger.org/57171554520.pdfIn PDF document text
    • http://hookup153.site/magigeweucjec.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/uiehhpA/81535189039.pdfIn PDF document text
    • http://umkatrade.ru/quotes_universe_life_everythingfrmtx.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jd96giC/12041394163.pdfIn PDF document text
    • http://benovezim.22web.org/birthday_gif_images_with_name.pdfIn PDF document text
    • http://yesstore.pro/download_real_racing_3_mod_apk_obb_offline0nb8r.pdfIn PDF document text
    • http://musofiron.ru/rise_of_kingdoms_best_civilizations_2020e2k3d.pdfIn PDF document text
    • http://ximasoj.22web.org/air_datepicker_format.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/dictionary_app_android_symbols.pdfIn PDF document text
    • http://zewegirugiputix.22web.org/nare_takbeer_allahu_akbar_mp4_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikejilewiz.epizy.com/konixitejatusadubixatibe.pdfIn PDF document text
    • http://sedilar.rf.gd/lagu_medot_janji_new_palapa.pdfIn PDF document text
    • http://wafovon.epizy.com/edmunds_used_car_value_guide.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/49370524327.pdfIn PDF document text
    • http://pigozezidum.rf.gd/heroes_of_the_storm_talents_guide.pdfIn PDF document text
    • http://zenejifawulo.epizy.com/rcm_business_plan_book.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 5628 bytes
SHA-256: 9caba3c3a2bbce2e557deabd8027a4fa2478bd1251029e5b64eb5e77ac663392
font_01_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10372 bytes
SHA-256: 807721422fc10dfed3190c200526d55f33c39b27db11c732be3240b421a46b06

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