Malicious PDF — malware analysis report

Static analysis result for SHA-256 77da3a53df42dd55…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 04:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be8a640dc08597ce1304d85cb44353f1 SHA-1: 2e60f7260ee6ab15cc349dd670311eb2acc94a86 SHA-256: 77da3a53df42dd553372e97fdd7e35e63732b7dd17733e0c79a2c145d708eef9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to PDF files on distinct hosts, suggesting a link farm or distribution mechanism. The presence of external URIs and the overall detection profile indicate a likely phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613278c33b886---40663120139.pdf
    • http://dentalweek.eu/userfiles/files/nonidejepuxulorilape.pdf
    • http://snft.ro/media/file/64804732286.pdf
    • http://vswet.ru/f/90265792833.pdf
    • http://kartinatv.org/uploads/files/wajojumil.pdf
    • http://www.koeru.eu/failid/file/lexev.pdf
    • https://pinkrali.com/calisma2/files/uploads/63665897598.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/bogerifuburupurunezigemaf.pdf
    • http://infas.cz/images/wiswig/file/32693451789.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/89837748999.pdf
    • http://instit.ac/ckfinder/userfiles/files/13724953824.pdf
    • http://fornacedelia.it/userfiles/files/49734734784.pdf
    • http://heydarbaba.org/resimler/files/daruzabopojegebebomejesuw.pdf
    • http://masonhn.com/d/files/83281843538.pdf
    • http://caogenzhiben.com/filespath/files/20210906074930.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/23491306540.pdf
    • http://jonme.net/ckupload/files/19700414079.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kgf+tamil+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d354.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 16792 bytes
font_01_sfnt_off0000eb6b.bin
6e470a0ba309e97de893a8b7bc52237fb162576d11711c163e02ff989a60de51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 10344 bytes
font_02_sfnt_off000102d0.bin
79338ca92c9ee6486647471998eda243022313d6d8fd317d3d53f0a425285a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 18328 bytes

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