Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f290a49f6371f6…

MALICIOUS

PDF

76.3 KB Created: 2021-02-01 03:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 55c9758edcd4043116eb53b633e08011 SHA-1: 91e99ebfac1cf1c5d978aeb0bb7c7f1c3d625670 SHA-256: e8f290a49f6371f67d4fb1c1bf3a27862734d19bfb1d2b2af376246125420980
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of many external links and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially malicious sites.

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://maypoin.ru/123?utm_term=how+to+make+cool+loom+bracelets+with+your+fingers PDF link annotation
    • http://forsage.pw/tapout_xt_download_megak5n7p.pdfIn PDF document text
    • http://usblighter24.site/wufowubuvosamubh2nh0.pdfIn PDF document text
    • http://nesobaka9.xyz/comptia_server_sk0-_005_study_guidex46g5.pdfIn PDF document text
    • http://edevletorg.com/50614682197xi6fs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5fe13edd3ade6.pdfIn PDF document text
    • http://itawegan.space/bafizeba3lk11.pdfIn PDF document text
    • http://opssmall.space/backstreet_boys_ages_nowqoxrq.pdfIn PDF document text
    • http://kdghy.online/a_level_pure_mathematics_notes3us5j.pdfIn PDF document text
    • http://yachts-4-sale.com/23726135253vgk6k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_600f8ddc3c6a0.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/bc80c7ceeecf0f.pdfIn PDF document text
    • http://sait-ok.ru/best_real_time_strategy_games_xbox_ones110e.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/teden_resixasatawo.pdfIn PDF document text
    • https://leximefowa.weebly.com/uploads/1/3/2/6/132680903/a64f9250.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/boxar_nokad.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/rizezobabub/catholic_bible_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/71687255269.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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5652 bytes
SHA-256: 2fb95c7206b7dd1ad4331edf4917ff01b65f6ddada54e66e65ee6c2487727b75
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 11504 bytes
SHA-256: 02d27c5ddb66cbefa5896f4ab95a1b88f84ba689b8dd9a924031582f39284ef7

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