Malicious PDF — malware analysis report

Static analysis result for SHA-256 9821633932a52ea7…

MALICIOUS

PDF

68.6 KB Created: 2021-09-16 17:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c016ddb4a0ea3e8041bb256242d3faac SHA-1: 58ba5ab8890ee3e469be1c98ec012cd4bb974940 SHA-256: 9821633932a52ea710a188ca98ce748cc9878395af21b402cf155c9c3bf7478c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, while many are unknown, contribute to this pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://callmarkinvestments.com/callmark/files/32649073361.pdf In PDF document text
    • http://aqs-group.it/userfiles/files/gajelepigekadukolo.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xowirezubegel.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/61f509c3e8bcd3413c70b08e426bbfc0/76590080618.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/65989301863.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/mujuxupojapozoxelajo.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/zomaragajetig.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/jilurebopilejojisi.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/vedagupatafuxeti.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/jabovokasiko.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210910_190646_191.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/63663126175.pdfIn PDF document text
    • http://lovesenergy.nl/file/87410629374.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/31546974109.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/8086865851.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/bebaribelugoxami.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/88655110106.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/73205538126.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/5478332164.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zodiposub.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/rererorotajejinole.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/robodilafemiwaxira.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210901120550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mario+party+nintendo+64+romPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC626 10692 bytes
SHA-256: aec87dcf2ed2db28fff309c8440f4e34b0a4b3d584c8899bebab6d1e9be4e2b4
font_02_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 15116 bytes
SHA-256: 0f18d5b7eb375d7411206bbc932c65bb6c58f1735eec34e1b9263abb33eff713