Malicious PDF — malware analysis report

Static analysis result for SHA-256 b956e77479c2516b…

MALICIOUS

PDF

82.3 KB Created: 2021-10-07 18:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b1e9a7d1a28d1ff0327e679e3120eae9 SHA-1: 39012288dcbc5026121d369f0c667205a4aabe5d SHA-256: b956e77479c2516b0654ed43ec08bfa30b29645f37152c6d99ec68511f2e281d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting, characteristic of phishing or malware distribution. The PDF structure and embedded links suggest it's intended to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://synerhu.ru/uplcv?utm_term=exclamation+point+after+a+number PDF link annotation
    • http://norilskgu.ru/userfiles/file/widiji.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/takisis.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/88373273173.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/mifazowewuxokuvefukuro.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/mepaf.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/bilepaxufafuvileperon.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/vaxalakalikibotubikaribe.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/50659891227.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/xiluzanakitivaz.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/6f6331a5a65a8d5394a35407970fa99b/41108371502.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/96882363554.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/koneruz.pdfIn PDF document text
    • http://juentai.com/userfiles/files/78556532710.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/vixakib.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/99676564106.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/40667858895.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614edb913c47f---42941282001.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/53852218599.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/sopovesudakodibakuzup.pdfIn PDF document text
    • 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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10800 bytes
SHA-256: 850f059b7be96a55750cd712be8a7ec4f881225783ae7609619a80cfb9b99f4f
font_02_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 18760 bytes
SHA-256: c6e1cb60f1fcf55c14ac72653fc6ed47009a7314b644045d8404c98d57abbdae

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