Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33185beb064524b…

MALICIOUS

PDF

81.0 KB Created: 2021-02-07 11:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e57aec04730a9e669b82b919400565c4 SHA-1: b6c2c7713080ede9664f516b5222f02c3c5abc9e SHA-256: b33185beb064524b1b4c5bef2d70a188fc8ee7bfe7b198cb9b3e5ebe392118c8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and potentially malicious content. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=the+lightning+tree+japanese+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5fdc443e75a2c.pdfIn PDF document text
    • http://qqkaxes.xyz/broken_sword_2_remastered_download42q3t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6005a435cf4ee.pdfIn PDF document text
    • http://forsage.pw/corbettmaths_5_a_day_answers_septembereof63.pdfIn PDF document text
    • http://starconflict-game.ru/nujuwefowosuwesk5ivl.pdfIn PDF document text
    • http://comforfemj.fun/rejudilebatocc9bp.pdfIn PDF document text
    • http://waniwidolo.66ghz.com/vuliligo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452169/normal_600032bcf1047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd8cd4221e98.pdfIn PDF document text
    • http://chatik85939775.fun/radawumakewusodpb3a.pdfIn PDF document text
    • http://fruit-ital.space/4409910646311u0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifonefoje.epizy.com/96128966359.pdfIn PDF document text
    • http://kamaxunavag.epizy.com/application_loader_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/xefizavesasefed.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/ankush_movie_khiladi_full_movie.pdfIn PDF document text
    • http://rusakarazixano.epizy.com/aace_dyslipidemia_guidelines_2017_ppt.pdfIn PDF document text
    • http://xefokezutuvij.epizy.com/gta_online_doomsday_heist_act_2_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/georgicas_virgilio.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/champion_manager_17_mod_apk.pdfIn PDF document text
    • http://terefikug.epizy.com/majavupubojese.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 3444 bytes
SHA-256: 81ceb16482083127eed664328d098d220b345e993349307aaa42f68726047406
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 5320 bytes
SHA-256: 2f6a44ee710205632c31aaa7f9fb1dda57c8aa72287e88312e4c14368b704c89
font_02_sfnt_off00011075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 11220 bytes
SHA-256: e319bf277190b520c64722c4b7d3c9412b853acf38ce5408c1fb810760106e93

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