Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d64a34f616bc25…

MALICIOUS

PDF

100.7 KB Created: 2021-04-06 14:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b5376c97d6cf0c9cb03c164afaf5d434 SHA-1: c94a74f860b5799cf33ccd09315cd4f8d1362873 SHA-256: 50d64a34f616bc256437817f410ef67a4cefc9d9e15d696c206fa4d5c7be12ff
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('dafemum.ru') flagged by heuristics as a potential link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+the+point+of+view+of+a+personal+narrative PDF link annotation
    • http://rekijiwowak.scienceontheweb.net/5921624144.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/54723859956.pdfIn PDF document text
    • http://jotewelife.iblogger.org/rubber_bed_sheets_walmart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_7a82bbd72ef74834bbd1e2e4fe5d19f1.pdf?index=trueIn PDF document text
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_f011c2b20a294175a9763a99ac141d14.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_ae878ddc26b1413e9571138ad3d72a12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/tissot_t_touch_2_expert.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/obd_android_app_source_code.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/punogawejizuku.pdfIn PDF document text
    • http://sidegiri.epizy.com/amarilli_mia_bella_baritone.pdfIn PDF document text
    • http://midexudotag.epizy.com/rogur.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/geralds_game_full_movie_in_hindi_download_300mb.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_1b4ebea13757486b9d6e9a273e900434.pdf?index=trueIn PDF document text
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_a1677d42726043728014ac70039b26ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/repowefividerexona.pdfIn PDF document text
    • http://juvusowupu.onlinewebshop.net/gupamilelodowiperaf.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/43147287464.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/29070924004.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/technical_communication_today_6th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/why_does_my_kenmore_dryer_keep_turning_off.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/cafeteria_management_system_project.pdfIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_de21b32fd3d24f8db280ff312f8e9ff6.pdf?index=trueIn PDF document text
    • http://ditanumugagoma.myartsonline.com/dosorasupudofupokosoba.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_off00014b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0E 5152 bytes
SHA-256: b759e98e4115cd45814028c0c1a6c7dc9fd61c0ede435a9d165991ece7ff488a
font_01_sfnt_off00015cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAB 12036 bytes
SHA-256: 52f59ddb9fe7eaa25b165cf110f3232255e0294e454244d0f22c4e995ab3f5fb

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