Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3afc61e97d11f99…

MALICIOUS

PDF

79.2 KB Created: 2021-04-24 18:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8f55a8448b781e098d6145d01073fb26 SHA-1: 731c3c40eb1d296df1e9fad3b041edda61352101 SHA-256: c3afc61e97d11f997a15e0a9e98c0802aff7ea594fb77cea137976081e430a2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, references 'Dexter commercial washing machines for sale', suggesting a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=dexter+commercial+washing+machines+for+sale PDF link annotation
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/24ba2ea15124ca9.pdfIn PDF document text
    • http://xefijemav.iblogger.org/frases_del_libro_el_arte_de_amar.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/kosoburimujurakikatox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5ffa956fab827.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/jajhchf/ielts_vocabulary_play_games_to_learn_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fff62f3968c2.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/V1gdqcC/blockman_go_pc_hack.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/pizasowofagisesesi.pdfIn PDF document text
    • http://mebotus.mypressonline.com/86058753826.pdfIn PDF document text
    • http://kolunikikirade.22web.org/puxiwumem.pdfIn PDF document text
    • http://wibubalitobidu.22web.org/23994188165.pdfIn PDF document text
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/cc87f66f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391001/normal_5ffb13d466a39.pdfIn PDF document text
    • http://toximakuvox.iblogger.org/complete_book_of_drawing_techniques.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/42561336821.pdfIn PDF document text
    • https://junanopawakeza.weebly.com/uploads/1/3/3/9/133999625/matezutike_fusenenulun.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/QhidgfO/80793510257.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/heig2PT/danielle_the_girl_in_the_window_biological_mother.pdfIn PDF document text
    • http://xezifimo.iblogger.org/vokepak.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/MihvVmY/sony_live_cricket_streaming_cwc_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loletusu.rf.gd/how_to_run_pro_tools_without_ilok.pdfIn PDF document text
    • http://mevelidefa.rf.gd/xefapodulevomofotaxefawe.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_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 5452 bytes
SHA-256: 3e17a1377583158022983db3ab4a0eed374535c8755015438706b37798ca5398
font_01_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 10908 bytes
SHA-256: e236396b4bdb7a13adf1cf6830ffd17b1b0ff13ce80028653016f7f7a0381d85

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