Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fac284b33145cbb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 02:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 800b5f04457c2ff4bdd6f30765ac6708 SHA-1: 561602b8665addf3b713cbca34afbcc860cd6120 SHA-256: 8fac284b33145cbb587f4684fc0cf39caa5ad83becbc74bc9566f9d801f54cf4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or unknown domains. The document body is unreadable, but the presence of many links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://rotang.net/userfiles/file/56007741.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a84d6388bf---86313328531.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/89408417317.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/48446757769.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/97271139267.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/86085896858.pdfIn PDF document text
    • https://susta.vn/userfiles/file/78364254387.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/34461360464.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/wuxuze.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/wazazigavipodugutoj.pdfIn PDF document text
    • https://digireg.cz/upload/vaxinerivirabogukoraj.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/palosudovazabitef.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_D583E00E5F0B21AB.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/18714235997.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/51437528708.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/93599399596.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/kaxiporoxebitatikotapozav.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/pebalujogesufilateraje.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/38377868742.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/reneledusuzixovozajobobot.pdfIn PDF document text
    • http://superazs.ru/images/news/file/ganagogelifilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+fastest+android+phonePDF 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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10540 bytes
SHA-256: ba1fd97311b3f3a23a6f9df4af868bcd55a626b29a6b6a0d5787fe19c7b211e5
font_02_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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