Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28ddd9ac56f8398…

MALICIOUS

PDF

85.9 KB Created: 2021-03-31 00:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8b975904c83210ebea620ff58511ef7f SHA-1: 3d427929ce7dd8c40c4a111559dca0eb410c29cb SHA-256: f28ddd9ac56f839854177ed94b8eb5b8175618bc843b340413235142ec732993
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism for malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document. No scripts were extracted, but the presence of external links and the phishing classification strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/award?keyword=thyristor+basics+pdf PDF link annotation
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/38321c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_604e7af0d6640.pdfIn PDF document text
    • http://sidikapefujuxe.22web.org/altimetrik_annual_report.pdfIn PDF document text
    • http://italysummer.space/westpoint_home_electric_blanket_error_codes_e4gfgxn.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/ecd4788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_601510f81ea89.pdfIn PDF document text
    • http://storeeu.info/90124557552jyx7w.pdfIn PDF document text
    • http://stavki-na-sport.site/angry_birds_2_cast_axelit0ho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6018861a73c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_602600d55e3e8.pdfIn PDF document text
    • http://mobile-media.moscow/nfl_injury_report_saints6dh3j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417405/normal_5fc604e3f22f1.pdfIn PDF document text
    • http://devlp.club/joterukavunurafuxawumaslfqe.pdfIn PDF document text
    • http://copyrightproblem.com/anglican_church_hymnal_freelzy99.pdfIn PDF document text
    • http://cleanup-sale.site/what_are_the_personalities_of_each_zodiac_sign3pdxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_600a0f2f8473f.pdfIn PDF document text
    • http://kengoru.space/how_to_reset_check_engine_light_nissan_pathfinder_2007tgipv.pdfIn PDF document text
    • http://it50disconto.pro/1569707832211q7k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412408/normal_5ff59aef86efa.pdfIn PDF document text
    • http://13millions.store/28542077732k6mtc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidufapikefufeb.epizy.com/mejor_servidor_ftp_para_android.pdfIn PDF document text
    • http://midetawedafete.epizy.com/gowedumegipiti.pdfIn PDF document text
    • http://lejaxofin.epizy.com/ketogenic_diet_download.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_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 5404 bytes
SHA-256: 57c051dfc8e7607bc3e6f0006b1c205b69ba34c2b122f98d7a45cceae790ed7c
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 11396 bytes
SHA-256: ff0d67eed799306f79351570b58c15e7464c88bf923de3957c3be990588f7b8e

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