Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a29bcda3218506…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 02:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f46889e689af82362197ec663aa2901 SHA-1: 3c4ab1106cc7fa77924c5902f1b9a3cf44d6241f SHA-256: a1a29bcda3218506e9d279d31a59c875b2c509cca69e7b91253d3014656ba1da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://borneneskontor-landsforening.dk/userfiles/file/zajijezuvewo.pdf
    • http://phongthuyphatloc.com/luutru/files/bedelos.pdf
    • http://majorpropertygroup.com/userfiles/files/59855631533.pdf
    • http://contelex.it/userfiles/files/tuguseve.pdf
    • http://orsini-blasioli.it/userfiles/files/82879587986.pdf
    • http://kerrya.com/ckfinder/userfiles/files/36684887691.pdf
    • https://khanikango.in/file/66670778727.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abeb4dfac3---78275794816.pdf
    • http://grandinhr.eu/images/user/file/25913554440.pdf
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/ramoretuvinen.pdf
    • http://win-sonic.com/ck_imgs/files/vosenejuto.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/17797812239.pdf
    • http://pileshoppen.dk/userfiles/file/sovifes.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/60146326132.pdf
    • http://www.sctiec.com/up_files/FCK/file/nogojotetudoxaw.pdf
    • http://cephedanismani.com/images/pages/file/bonamotaxewijikozo.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210918_D4141A896A909BCC.pdf
    • https://widepolymers.com/userfiles/file/vukumuroti.pdf
    • http://newbiesites.com/userfiles/file/63325106928.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54520829396.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/58327618790.pdf
    • http://crystal-lamp.ru/uploads/files/21394508149.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hum+tum+movie+online
    • 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_off0000b95f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 16792 bytes
font_01_sfnt_off0000d171.bin
2bfb555b34e04b70a81cc494f1eea7aa64968024c45525570104eae67b7ea608		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 16252 bytes
font_02_sfnt_off0000fb6b.bin
82725fdd7602452d813c25aa44dff36925b5a372ca9c303184cb6a853b9201f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 9996 bytes

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