Malicious PDF — malware analysis report

Static analysis result for SHA-256 f341b5b4eacb18c3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 00:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b5480e990bd3731a7fcbc17ed4a3779 SHA-1: ca2b9a00c55ab9ab0289d28694db17800c80ce0c SHA-256: f341b5b4eacb18c37e7cd4ee5ef5086a1464e15f256eff27f6b1f796af5d3ca3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link farm heuristic and the sheer number of unknown reputation URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

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://amidoux-peintures.com/ckfinder/userfiles/files/36051198788.pdf
    • http://uptownchantilly.com/uploads/files/bobixeje.pdf
    • http://fernandopelosini.it/userfiles/files/95398206335.pdf
    • https://wildarium.com/ckfinder/userfiles/files/33179803281.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/78699514180.pdf
    • http://cppzone.ru/users/blogs/file/tuwufimagigujujikegexi.pdf
    • https://nmg.lv/img/uploads/files/zuzidavenamogibejugov.pdf
    • https://ismart99.net/upload/files/10030690901.pdf
    • https://035620126.tw/upload/greenkitchen/files/14374757074.pdf
    • http://pietrek.com/MARCUS/files/file/kabujapupobubamobavi.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/rokiv.pdf
    • https://cbconsulting112.ca/userfiles/files/fadilabidipas.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/88292083363.pdf
    • http://www.peretprod.ro/content-images/file/luxefukiluxaxefu.pdf
    • http://hzqzg.com/d/files/28113249262.pdf
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/pepedesejoremiva.pdf
    • http://soles2walk.cz/data/file/nemezofewakumaribixasanet.pdf
    • http://rakkhunnursinghome.com/user_img/files/xixoluk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=blue+mail+lite
    • 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_off0000d720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16792 bytes
font_01_sfnt_off0000ef36.bin
bcd10371c0d5c00765f7f7f7b2adda0ee63919465cc52f0566ff08b3aa3f8634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 9932 bytes
font_02_sfnt_off00010529.bin
3c467662e88252752c0391b67b680d38ef21507ef33b954a91573dcddd2aa452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 18152 bytes

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