Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a0de0ade629d1e…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 07:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8159bf6eebcd4c4b571860392a900c85 SHA-1: 524a3916d75577362577f1b420e6562882354d93 SHA-256: a6a0de0ade629d1e674044abe92112267112074b48dee4aa9d83e105e4098aae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/123?utm_term=what+axe+deodorant+smells+the+best PDF link annotation
    • https://cdn.sqhk.co/zubavagi/Kjd3Iic/30602643100.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/higVggK/80076509398.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/c71ghif/airthings_radon_detector_corentium.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/xosuniferomakunieiwfj.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/vipomi.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/lhfm5hc/fosupanotosolejiwuv.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/3634454.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/gilavisunubov.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/7hdJ3v2/tactical_tuxedo_top_down_shooter_game_maker.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/tazopaju/any_video_converter_ultimate.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/vumanigokerudedulozi.pdfIn PDF document text
    • http://jifagul.rf.gd/34469937669.pdfIn PDF document text
    • http://zaguvigijosev.epizy.com/bancassurance_guidelines_malaysia.pdfIn PDF document text
    • http://murarefap.epizy.com/sqlite_browser_android_studio_plugin.pdfIn PDF document text
    • http://xesijapapun.rf.gd/jump_force_switch_dlc_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/advanced_calculus_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/67018117421.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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 5284 bytes
SHA-256: bcb209ae0c47ecf6afbd64e81cd7e396011ebaf0e11107f1fc75a6d2ec7baa1d
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10484 bytes
SHA-256: 6f2a3abea84610d9238ca8b9c007a083639ebf8198dba6e5a06d9bdbab25a5d9

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