Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0994269885046f1…

MALICIOUS

PDF

105.0 KB Created: 2021-09-08 23:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c531f1284c1a1c3fc4eebfa5ffa7d95f SHA-1: 5a26cc7a9815b5dff5fc58ac0d1a3bfceab7d6ff SHA-256: c0994269885046f137dfd86bd3e9ab34758b5a28ee9af9fb99296b5b5768fcfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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=mi+9t+update
    • https://talenthunt.biz/userfiles/file/7020639658.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/96962742849.pdf
    • http://liebherr-tr.com/userfiles/file/14180450896.pdf
    • http://studiomalpocher.it/userfiles/files/vorulubavozodobelutixekom.pdf
    • https://rainbowfurnitures.com/files/files/77919305145.pdf
    • http://changrung.com/ckfinder/userfiles/files/jomegefenaleronew.pdf
    • https://nationalshield-uae.com/userfiles/files/66525294008.pdf
    • http://ingfrimale.com/userfiles/files/78475601869.pdf
    • http://24cvety.ru/upload/files/mogefezopomolarevojirugeb.pdf
    • http://annassteen.com/ckfinder/userfiles/files/56474828206.pdf
    • http://brenna-ski.pl/userfiles/file/diwutoresevirowoxarigi.pdf
    • https://birutelorasin.com/contents/files/woritirajutila.pdf
    • http://ainut.fi/userfiles/file/xowisofokerufuno.pdf
    • http://pitchdecor-construction.com/user_img/files/biguru.pdf
    • http://inica.org/files/file///biwinudopedelawakez.pdf
    • http://medicom.pl/userfiles/file/68802236345.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357a9141ca6---buwisexusipumoro.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e6.bin
0d38d1bc8e0c47fe917f535469462f3257e6099fbccd4de7120527fa3f2d739e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 25008 bytes
font_01_sfnt_off00014736.bin
c33856c2eec017ce92829c95d82df80111363fdd837bb46c2cfc6424554bb3fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 10108 bytes
font_02_sfnt_off00015de0.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE0 16232 bytes
font_03_sfnt_off000173b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173B9 16792 bytes
font_04_sfnt_off00018bc6.bin
ec5c5896b16e0578f001c2b396f60d2cf8b49d3ce3bd490f9669bae7bb92d43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18BC6 1904 bytes

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