Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f382521b4436d7…

MALICIOUS

PDF

101.6 KB Created: 2021-01-26 03:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6594afde59ca252cd4f127c498d15551 SHA-1: d5cbb762903a9fd5d6ae980190d3c5d97a0ee7cb SHA-256: 88f382521b4436d78c260121571bf2813347e26faa2506045041524373457cc8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure to download further payloads or engage in phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffking.ru/123?utm_term=william+smith+%2528actor%2529 PDF link annotation
    • https://cdn.sqhk.co/nomitusibop/7hdhihh/download_game_real_bike_racing_3d_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fefc1b8e5f83.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/dPjdohb/vecm_impulse_response_function_interpretation.pdfIn PDF document text
    • http://cancandance.org/gigunizizaboxazuzaxorw4n81.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/Iggnwjb/senuvadexafomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456379/normal_6001162523877.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/9NDoLih/bottle_green_jumper_school.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/jcOifko/what_are_the_buttons_on_alexa_show.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463533/normal_5ff0808989112.pdfIn PDF document text
    • http://big-ita.space/download_samurai_ii_vengeance_modxvduu.pdfIn PDF document text
    • http://tradebot.space/thumbelina_toad_momon2za.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/FhayJii/jexeziriz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_600f6fabe41a3.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/geOhdXc/smart_tv_32_inch_1080p.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/gh1uahh/pro_mx_3_apkpure.pdfIn PDF document text
    • http://itslm.fun/125755089927i6el.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubadel.epizy.com/82782018911.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/sulukunogerofipulenufip.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/52692274606.pdfIn PDF document text
    • http://lamerowed.rf.gd/acute_exacerbation_asthma_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/15453414377.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/tokifamufexoxu.pdfIn PDF document text
    • http://wukajilese.rf.gd/ordinal_number_worksheets_2nd_grade.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001500e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500E 5204 bytes
SHA-256: ac2e0167bc250943a65579ab54f30046e647cb4455b17b61cf41d62728801694
font_01_sfnt_off000161b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B3 11596 bytes
SHA-256: ce638ce96734b135d1e671351d4ee9c531cfbca043b0b15ce6815a69bcd4295d

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