Malicious PDF — malware analysis report

Static analysis result for SHA-256 9713823c12080ea1…

MALICIOUS

PDF

73.4 KB Created: 2021-03-15 14:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2931fd80e3d5a78ebcc8e9333eef4fe8 SHA-1: de28f11d61513b9785d0cd0c0dd21595eeedb5b1 SHA-256: 9713823c12080ea1c01f16c7a48fdca709a9ce419e68d1a98ef8528c891b6776
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or unknown reputations, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a likely attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=after+effects+shortcuts+pdf PDF link annotation
    • http://remoliwagofaju.mywebcommunity.org/9284672270.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/aNAkRhe/ultimate_lion_sim_mod_apk.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/dogiredibunode.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/hiegahh/satotavipugikurejison.pdfIn PDF document text
    • https://cdn.sqhk.co/miseseren/oDLEhat/airport_control_tower_pc_game.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/ywnQYhj/archipelago_candles_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/VYihpgg/fadorudos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/the_language_of_composition_chapter_1_activity_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/guided_reading_books_level_a.pdfIn PDF document text
    • http://kevawiposiwa.rf.gd/usps_vj_tracking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57eb1c11-5ff7-438a-bafa-e44673a394be/33827323302.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/wubinunanubedetuw.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/enlace_sigma_y_pi.pdfIn PDF document text
    • http://busajolixaba.epizy.com/58470927104.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_4712f1867d82480b89e777291ce0f557.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/best_audio_editing_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292420d0-2c5b-4cc6-906f-070bea48dd0a/how_much_do_sat_test_cost.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/30858245705.pdfIn PDF document text
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_88229e53bcff420db278a41d0223881d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a1dd8a-23ed-40a7-941c-99a6303e983e/daniel_plant_sente_mortgage.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_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 4988 bytes
SHA-256: d721ba5bdef46aaffb258e8952776712d76263d6333151f5ad988c245703a4d0
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 11068 bytes
SHA-256: b0c445329c63ce16b72817cf2dd9ed9321966e4a4fa200956ee759b9edbe8d9b

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