Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2aa75d37d316a2…

MALICIOUS

PDF

71.3 KB Created: 2021-02-17 00:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c245ff5ca808c777788194f60a08cf79 SHA-1: a1ef6c41f7f991365436303f33f3a6d7809b97bb SHA-256: 7f2aa75d37d316a2c3ebaa124afb7e9d833fbd1780b856ed9366afd067db0ad2
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. It contains numerous embedded URLs, many pointing to disposable hosting or redirectors, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/strik?utm_term=autoradio+sony+xplod+52wx4+reset PDF link annotation
    • https://wetexojozow.weebly.com/uploads/1/3/0/7/130740218/lukulan_sebow.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/hijgaic/free_download_game_bus_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/C3Chjgc/flying_arrow_archery_cyclone.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/9754ee4cbb5dcdb.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/tovusikiwagagulawog.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/gifif2R/sudoku_puzzles_evil_level_3.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/gexinoxituli-rifagup-xerefazogimuj-vutofarixiga.pdfIn PDF document text
    • https://bijesuvudapij.weebly.com/uploads/1/3/1/8/131860553/9265a91.pdfIn PDF document text
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/52fcc73702.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/navuwanamo.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/IUrU5gj/ai_chatbot_python_tutorial.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/7026882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/mefepumududizugegebe.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/autoria_e_plagio.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/hark_how_the_bells_piano.pdfIn PDF document text
    • http://widuxetikos.epizy.com/nedemawupuminak.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/47605415437.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/17977954177.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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 5548 bytes
SHA-256: 8f4af5ceeba3b96ae2fead831108157ec8c5e521759adbb3ba360c5fdc82bfeb
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 10352 bytes
SHA-256: c6fc44b379a2bea1b259321590d22034b6160d2eb1e17668566da8c9cb88e85e

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