Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf33a322c108dc8d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 09:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1069af14d4bfb449902139eaf7e8ade SHA-1: f896d49a4cb76331b0bbded75011c2522d540114 SHA-256: bf33a322c108dc8dfaaf42e9ce304c73517d4b1ab2424612535d7c3ab48fc205
146 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. It contains numerous external URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tempegaring.com/contents/files/55714878696.pdf In PDF document text
    • https://zibarajabi.com/cache/fck_files/file/86549831375.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613567db93081---91846612494.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e7e61f24---57348434063.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/vefokabexi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614391f5943fd---dojipojavumasuwo.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/visulusalujiwokop.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/11538829548.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76234726653.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/rezosimu.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/71943190861.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/75019919186.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/1535749685.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/41374621792.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/dapasalifixobesuxu.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/towabanajijuzelejilawam.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/62448826848.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/rinufotosom.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/80802804413.pdfPDF link annotation
    • https://blugarden.eu/file/53636364930.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/norapapuluvofisilutode.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/68739344263.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/7348998692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=4+letter+words+with+b+and+vPDF 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_off0000c5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 10616 bytes
SHA-256: d62cdd737d8a16938dcea8cdca631a1baa9343abb1d8637d20fe7aa16d1f2e69
font_01_sfnt_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 17844 bytes
SHA-256: eacdb11afb889b548db7f8fa2a4402fdbd3f482c89e10bc8bbb62330811b1a04
font_02_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1