Malicious PDF — malware analysis report

Static analysis result for SHA-256 85474bd2efff1cb5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 15:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3007b9219ba0785774bca83465df9c5e SHA-1: dea3f0e8c70abc21952b7251ba85718ce2bca2fc SHA-256: 85474bd2efff1cb51df173524465a11d07b90653380f20396f57f6e6446eda4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sireny.net/share/files/dinegivija.pdf
    • http://z-i-f.ru/userfiles/file/83955294755.pdf
    • http://grupopiscis.com/upload/files/36466394202.pdf
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/67759709926.pdf
    • http://autosoftware.company/autoresponders_images/files/lalotudura.pdf
    • http://igabana.com/upfolder/e/files/20210912015652.pdf
    • https://hotelite.in/userfiles/file/63653869820.pdf
    • https://hoatuoi360.vn/uploads/files/4301863775.pdf
    • http://ekhoron21.mn/uploads/files/kufuje.pdf
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/sotutovobamex.pdf
    • https://adamant54.ru/userfiles/files/zavekofoguposixabezajijo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334bcb7ce81---75645088720.pdf
    • http://usagimatur.com/files/others/talekebukitox.pdf
    • http://debnine.net/UserFiles/File/nifiwavokajafojoza.pdf
    • https://businesslife.com/content/files/74710775023.pdf
    • http://joeun-it.com/userData/board/file/1890033951.pdf
    • https://km2804.com/ckupload/files/59589659944.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunoxedeviv.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6ciemv5un70p2u8v76dnmouopa/43525941255.pdf
    • https://hoakhanh.vn/uploads/image/files/zagoreza.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/58047451687.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/54539568846.pdf
    • http://giorgimpianti.com/userfiles/file/sezudusalasiwuvam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=miui+11+gestures
    • 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_off0000dec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 16792 bytes
font_01_sfnt_off0000f6da.bin
7bf0c728c026a6b73d691ec3aa20ffac8e37887732b028a31f90a8e01020f29e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 9996 bytes
font_02_sfnt_off00010d2f.bin
d588039265a65ea586e4bc8940465ae7c239ac57cfefda6c73c6053f2a75019a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 19684 bytes