Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd81f4771dcada3…

MALICIOUS

PDF

169.0 KB Created: 2021-03-08 06:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f598ee25a606446016000152d8b0905 SHA-1: dd4918eefd8e5dd25a0d6e5f2f9677d6a2bb219c SHA-256: 2fd81f4771dcada3d0bc19098c62a18442edb9edbf2722e0550854da4ba2ef24
166 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The numerous embedded URLs, many on disposable hosting, suggest a link farm designed to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=ars+notoria+pdf+espa%25C3%25B1ol
    • http://kimokabif.medianewsonline.com/61626128366.pdf
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fc889ef4eb26.pdf
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/pitunapisajotob-mubowubilowi-suzisidoroni-gutabobidesul.pdf
    • https://womukowewefe.weebly.com/uploads/1/3/4/8/134889771/8164836.pdf
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/dobaluwuzamomeg.pdf
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/xokoluperofekef-kiboxuteri-xizipitobab.pdf
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/gimegokozitisiraxe.pdf
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/tulerilajirixovomeke.pdf
    • http://wozonos.22web.org/m.a_english_literature_jobs.pdf
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/960758.pdf
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/vixuzoxusod-dutopibolutazi-tokafizosunimeg-zejemunisizer.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/1968513.pdf
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/belikaposip_ruxafaruzu_zijolovapobo_nokamedop.pdf
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/jamususa_bukovewufi_nugan.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_603e655180f16.pdf
    • http://wamijuw.22web.org/alan_watts_audio_books_free.pdf
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/sadoxozudeti_pimudar_bulavolopof.pdf
    • https://nigupuwifiva.weebly.com/uploads/1/3/5/3/135329906/tifobesoraz-jisekifu.pdf
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5ff7d5b732355.pdf
    • http://zuzorovix.scienceontheweb.net/tolokisizitawijemaluseve.pdf
    • https://cdn-cms.f-static.net/uploads/4393022/normal_60168cb5bcc3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nononulavojiki.myartsonline.com/likiraxezewalese.pdf
    • http://sonunujudul.rf.gd/nusudazu.pdf
    • http://puwavunetese.rf.gd/interpreting_graphs_worksheet_5th_grade.pdf
    • http://vagonaziluro.epizy.com/16402062541.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024e17.bin
103ad52f19740c41248c873051b21731d21d7e82b3e598d0a1ddd3abdae3cff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24E17 5024 bytes
font_01_sfnt_off00025eef.bin
561321809137cbcd75f557c1156897c6e3d8e63cdcbc81c5c5ee05f2495c15b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25EEF 12308 bytes
font_02_sfnt_off00028628.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28628 4324 bytes

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