Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff8164c7c52ef45…

MALICIOUS

PDF

82.7 KB Created: 2021-02-25 06:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fd587d15a6a4c4e165be9a9bbf0ca10d SHA-1: 5d8b9acd9c72116bd6de2ff3e40873691b348af6 SHA-256: 6ff8164c7c52ef452b94902bab2f72340b3201b0fd7f92ad8b79d448c51a5f6f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, strongly indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely as part of a phishing or credential harvesting operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=are+rival+crock+pots+oven+safe PDF link annotation
    • http://sevowina.medianewsonline.com/mufixojogufokadali.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/arnAih0/nautical_life_mod_apk_2._122.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/h9gde92/koala_bear_sounds_like.pdfIn PDF document text
    • http://datab.vip/diy_halloween_paper_crafts_easyme41e.pdfIn PDF document text
    • http://bettermoneytips.com/48579333338ihh4g.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/J1LPjdw/ski_suit_womens_sale.pdfIn PDF document text
    • http://usene.xyz/java_swing_button_font_size0q0yr.pdfIn PDF document text
    • http://stankoff.org/what_are_the_rules_of_grammar67vsv.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ijgfmie/the_last_vikings_escape_room.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/hIxphew/spacewar_steam_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/jb32jah/jerudo.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/igeWohb/open_secure_folder_s10.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/eHidHgi/letixojolul.pdfIn PDF document text
    • http://gratoramaa.space/76027605901mhubq.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/tGphegh/rodunematifojuz.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/tonisefoteka/my_kenmore_dishwasher_wont_spin.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/is_online_raffles_illegal_in_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/tasesibefederowarabat.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/pajebemaxamidododif.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_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 5120 bytes
SHA-256: e082d407d47c5bff88d856b2dd42ffbfb071659e966692cae7c013afdc41d96a
font_01_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 11008 bytes
SHA-256: 9ae6ef02920f163c2c4df3d2beb10ef8995a9bbed318d5f87f164913fb39472a

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