Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f21a8e4fc29e6e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 04:33:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a2040a7f341928868af2828aef1eb4 SHA-1: 902019cfcd9f4bc66bf4896393ce924bfc7fe1b4 SHA-256: f1f21a8e4fc29e6e58bc563512f1ce651c4f5aa11aae31863215e5c23fafa8ea
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it directs users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving the exploitation of user trust to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/wix?keyword=dark+souls+2+pyromancy+build
    • https://cdn.sqhk.co/zasemewiti/fghjekN/safari_przelaczanie_miedzy_kartami.pdf
    • http://899themes-demo.ru/89624597658lp572.pdf
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/ea6f8.pdf
    • https://cdn.sqhk.co/pigalixow/cym4hbs/king_of_dirt_apk_hack.pdf
    • http://nerroba.info/listening_skills_gamesv3rej.pdf
    • http://freefire-gifts.com/how_to_make_a_simple_cake_at_homemi2rj.pdf
    • http://zikewexer.scienceontheweb.net/wovefijumisevolafoxudi.pdf
    • http://tepugorotewole.medianewsonline.com/ayushya_homam_mantra_telugu.pdf
    • http://antonioita.fun/sasosugofg8wh.pdf
    • http://wiinorama.fun/jee_physics_questions_with_solutionsykc24.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/972284.pdf
    • http://siankaanmexico.com/don_t_bet_on_the_princezxm5f.pdf
    • http://razvivatel.blog/869778859644a14i.pdf
    • https://cdn.sqhk.co/dozirolizilu/hhNjiWs/wogadazigajogesuka.pdf
    • https://cdn.sqhk.co/leluforeref/bhgTFEz/54696363221.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/702fc3a7-88c6-481c-b130-0af240f96a34/fexugirukalupup.pdf
    • http://geforagegi.atwebpages.com/pikotizetagaxivu.pdf
    • https://uploads.strikinglycdn.com/files/9465c953-3406-42cc-8904-a6006c893b69/how_do_you_troubleshoot_a_karcher_pressure_washer.pdf
    • https://uploads.strikinglycdn.com/files/f35fc7f7-abea-4042-b8ae-4938eb9eeb56/greek_god_muscle_building_program.pdf
    • https://uploads.strikinglycdn.com/files/7bac9736-39e4-4f10-8db4-80b6922101db/honeywell_barcode_scanner_manual.pdf
    • http://kuzemepusiloj.onlinewebshop.net/15672084055.pdf
    • https://uploads.strikinglycdn.com/files/7c85e5b1-9138-4534-8983-d263e515a7f2/mcat_percentile_ranks_2020.pdf
    • http://fotizojorirepel.onlinewebshop.net/xurijuwibukeluje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed08.bin
4b4bac50712d87cf267c869a3972555d488ee09acbc34ee5c9e5ec30ae0ce465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5656 bytes
font_01_sfnt_off0001003c.bin
60429405972084014edebf3ea8d1d573e88856e5fba86f41b1e39610ab797ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10436 bytes

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