Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea73ea1c87a7752…

MALICIOUS

PDF

78.4 KB Created: 2021-03-10 12:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 13cbf0979be7530898c8be5a43fbcacd SHA-1: fa9d5c50cd7b95157391643b6068c0ec7d3fd6ec SHA-256: 0ea73ea1c87a7752e6e5a787ef0f29fc7fec31b215dd2a74190dc97d790f594d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/award?keyword=architecture+of+data+mining+pdf PDF link annotation
    • http://kozidozilujivox.getenjoyment.net/kodeker.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/juwarixodepejugu.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/6d4243740d123.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/08a5e52d883.pdfIn PDF document text
    • http://itdomen.fun/razobagufefubawewa372jh.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/eO6ifAC/54887876411.pdfIn PDF document text
    • http://lazadacostumercenter.com/vutataz6rao.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/8782080bbe.pdfIn PDF document text
    • https://zamupegokeza.weebly.com/uploads/1/3/1/6/131637483/zetilo.pdfIn PDF document text
    • http://smartycredit.info/how_to_replace_york_furnace_control_boardkcg26.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/siraka_witegovodasafoz.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/fGdKjiR/78671205612.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/lower_back_stretching_exercises.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/kawededaneluxobibawuwu.pdfIn PDF document text
    • http://medway24.com/70772642161ilkbg.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/56238264208.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/lekelepowo/what_are_the_similarities_and_differences_between_cats_and_dogs.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_28eb68e811494bb99946a7eb8d88edb1.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_8aa89a1e5b7d4c9f8b87ca4cbe561a82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/new_3d_pc_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/pubg_mobile_hack_mod_apk_file.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_e6a5de5503144b2982b0e1086569c14c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/xafikanobinupezugekov.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/5049022887.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_f4f78868965849fa9455942733ce4061.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_9140abe30bb7416b9c6f7736b7d3851e.pdf?index=trueIn 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_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 5348 bytes
SHA-256: 08eb68eaea3a66779d6f2216b05cb132a162b056e43262a1133a05bad336b309
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10248 bytes
SHA-256: b670fe8e59dc1accb2a83a80f4a4a00ed67f0dc094c3ff94e691b7160c1fbcb8