Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c99c2522e619bd…

MALICIOUS

PDF

76.0 KB Created: 2021-04-10 08:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 94279d158a04146bcce448487a7926d8 SHA-1: 1046934f2016873af0bfb8f6e59148b847047220 SHA-256: 64c99c2522e619bd67a46d1b786fa819fe695ba819b092559a8650b52a7003e8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, references "Basics of biblical greek vocabulary cards pdf", likely a lure to drive traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=basics+of+biblical+greek+vocabulary+cards+pdf PDF link annotation
    • https://cdn.sqhk.co/dewufidabo/mjcjeie/vilopomufa.pdfIn PDF document text
    • http://glawerry.online/32963988555sj4hp.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/hGjblie/7218340317.pdfIn PDF document text
    • http://dedaruk.scienceontheweb.net/wimone.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/CPhgib3/refepugejavoxilela.pdfIn PDF document text
    • http://biggymstoe.com/rezutufubinilo6m0d3.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/enthralled_giana_darling.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/celebrate_recovery_lesson_13.pdfIn PDF document text
    • https://cdn.sqhk.co/podadoxafa/ggGRAg5/bernoulli_s_theorem_apparatus_experiment_report.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/czphjih/real_casino_games_win_real_money_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujafugakare.epizy.com/gimp_tutorial_layers_youtube.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/96984911894.pdfIn PDF document text
    • http://gufogima.epizy.com/wijasubuxo.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_f0845ae327db4cd58bb23b000fd62fa5.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_43d6dad0d0a943559dbb40d24f1d0b54.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_d995d7a4a5d04225b4c26a3d39635d61.pdf?index=trueIn PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_c7b74d51018a4f909bb2374104d890a8.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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5736 bytes
SHA-256: dd37a3c2902f254c765e2ea56b6fe00d838a7f00a71a1c3b2fcd37a52ba62724
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 10864 bytes
SHA-256: 042341d79fed7691deda3c85cb967cf6b4b746520bbf398d403ee731f6ba51e2

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