Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cf1dbb31b64d74…

MALICIOUS

PDF

72.4 KB Created: 2021-03-26 01:38:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dd0fbef3c50ff2154cfb1d35925abdd2 SHA-1: a020474d8412c281cbad20b30d9565e416f90767 SHA-256: 64cf1dbb31b64d74ef94e00b1617e85e622e0c2109a3d8bffc8db32f453308b9
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URIs, with one notable example being 'https://pelibifir.ru/wix?keyword=zeks+air+dryer+maintenance', suggesting it functions as a link farm to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=zeks+air+dryer+maintenance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489844/normal_6022333e1aecb.pdfIn PDF document text
    • http://euroshopmn.space/bitcoin_miner_android_v1._02zdfy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_6008955ec910d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fe2dcc27f87b.pdfIn PDF document text
    • http://ketosimple.online/meade_telescope_directionsugsnf.pdfIn PDF document text
    • http://girlsbeach.space/talking_tom_gold_run_android_1_comxf95h.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/55115766463.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/makkar_ielts_speaking_download_2020_may_to_august.pdfIn PDF document text
    • http://meetsol.xyz/kemirul17okt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_60413134aa3be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligekasuxube.onlinewebshop.net/basic_algebra_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a2fdc14-ba21-4c09-835d-e357a7185947/someralakakevamovab.pdfIn PDF document text
    • http://xavujoz.rf.gd/pumumajewovufi.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_4bfbb941af264924b20153ef5a4354b9.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f71f3f6d67034fafbdfff99ec878f2d3.pdf?index=trueIn PDF document text
    • http://fulisawuxulinis.rf.gd/gattu_battu_music_video.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_2c10785fb4ab41aa90449ffdbaa2068f.pdf?index=trueIn PDF document text
    • http://bewukikakew.epizy.com/8778728839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a9539b-a187-458b-b5b0-dfbeaaee7393/where_to_find_the_expiration_date_on_a_cosco_car_seat.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/human_genetics_textbook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 5176 bytes
SHA-256: b006b9a16235731a0a21b9a786c83efb0fe8b88a581422c02b3c23818971512d
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 10856 bytes
SHA-256: 8dcddb34c5995a0bd54f94fc4be15e12736de92346553479ee8f0dedca47ebec

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