Malicious PDF — malware analysis report

Static analysis result for SHA-256 28762a99c67e0a5e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 11:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13dc506f47a46770baf4b44dbc41f06b SHA-1: 0716ddba5d99d00a1288cdb877cfbbfb8c9cad27 SHA-256: 28762a99c67e0a5e0fe4284262bd6d095ef46c936911910045c3ecdbc1bb3624
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though partially garbled, suggests a lure related to "combinatorics problems in PDF" to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9268

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://botokaw.ru/award?keyword=quest%25C3%25B5es+resolvidas+de+an%25C3%25A1lise+combinat%25C3%25B3ria+em+pdf
    • http://zikewexer.scienceontheweb.net/vovukakivevegam.pdf
    • https://cdn.sqhk.co/dizukenepu/geZzXhe/vadowapuku.pdf
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/mojorofuf.pdf
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/rodexanenar_bujurogefowomel_suxazomigoran.pdf
    • https://turezizudowan.weebly.com/uploads/1/3/1/6/131606253/ef5bab21a2.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd6527c8f6f7.pdf
    • https://cdn.sqhk.co/zifuvifiweva/jaheUju/buwakogoseninigabe.pdf
    • https://cdn.sqhk.co/sewuvavimebi/d3Wqiad/1784355266.pdf
    • http://xuvaxujogilo.mygamesonline.org/liftmaster_elite_series_3800pld_garage_door_opener.pdf
    • http://zifeladawu.scienceontheweb.net/moxelelarunada.pdf
    • https://cdn.sqhk.co/gotuxixovumu/nIchit9/71435905118.pdf
    • http://korixoludofuguk.scienceontheweb.net/27036949245.pdf
    • https://cdn-cms.f-static.net/uploads/4452612/normal_6032df18ce6e8.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_602b28637f2bb.pdf
    • https://cdn.sqhk.co/zibomevuguli/eTgiiaM/kibibefumupezu.pdf
    • http://zoomita.space/sag_modified_low_budget_ratesh983y.pdf
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/1940606.pdf
    • http://egosikenclub.com/jilar0kkvw.pdf
    • http://lalat.space/notes_online_drawz9y5h.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dowuvoduwitovos.atwebpages.com/density_practice_worksheet_answer_key.pdf
    • http://bitenozof.atwebpages.com/parcc_practice_test_math_3rd_grade.pdf
    • http://perexuwofogefo.onlinewebshop.net/duwelijutumozuganekiperab.pdf
    • http://vawerudarasikow.myartsonline.com/tumeverovelep.pdf
    • http://wutejaxevewef.myartsonline.com/.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec56.bin
7a00c62e538ab3a8f9b8b86f73f82022bde50fbd8c409e695ccfd15bda3d9b34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 6152 bytes
font_01_sfnt_off00010012.bin
c4e6992bd9da754725676d13b287496056d086ed113d90815b537b9f0cc78724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 13064 bytes

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