Malicious PDF — malware analysis report

Static analysis result for SHA-256 c004fe45c0ded264…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 16:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44431acfe917d893973700eac85571dc SHA-1: 9e0322c74e1f272c9adf9cbc761f061e14b44694 SHA-256: c004fe45c0ded2646b401987cd9cbd7818be46bd7066202507a7b34deea980f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites. The presence of multiple external URIs indicates an attempt to lead the user away from the document to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=ppt+for+android+app+development
    • http://szyldkj.com/luodan/images/userfiles/file/65164987940.pdf
    • http://alanaf.ru/userfiles/files/17789738555.pdf
    • https://riwg.in/userfiles/file/semasitogad.pdf
    • http://vikingpaint.com/user_file/file/sokikikisamawomujikowixa.pdf
    • http://rongqichem.com/upload/files/jatodajevofaxijut.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevovemipatok.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/55552406952.pdf
    • http://4bx.pl/public/file/gukefuvilalapuwuwunizon.pdf
    • http://rialta.ie/userfiles/files/26645082170.pdf
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/2662683060.pdf
    • https://nikosdimos.gr/userfiles/file/47737067506.pdf
    • http://signauction.net/userfiles/file/kunemijerup.pdf
    • https://network-italia.it/file/23180930466.pdf
    • https://buddhaart.in/userfiles/file/wekupiduzejigopuwutadex.pdf
    • http://bk-plus.at/userfiles/files/gipofowi.pdf
    • http://yey.uw52.com/upload/files/wigizalumuzumumor.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wugagoduza.pdf
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/67602850396.pdf
    • https://hoangnhataudio.vn/media/files/93310067966.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/zijaxagipolopuma.pdf
    • http://sitarofindiamd.com/userfiles/file/lobelitasevomirokizapogi.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/54874276857.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/87090651670.pdf
    • http://stensoproject.com/userfiles/files/wewokosubuxegagimin.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5c62756290b9cebb3efc832e8e191fc6/96967495944.pdf
    • 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_off0000e459.bin
276301c62454894909ffb558ed0a8b04d15849140f899b04776f060eb88db70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 10560 bytes
font_01_sfnt_off0000fc66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 16792 bytes
font_02_sfnt_off00011478.bin
467f87f54db82ca09bb6c814fb6f702981da99b12b9d7fb79f528801d4f6b484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 18164 bytes

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