Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af570350b5c4ec3…

MALICIOUS

PDF

82.2 KB Created: 2021-10-07 18:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33c7b9f32aee2f76d506a7c2d26de91f SHA-1: 1cc3be3165bf9a50d11567e7a83a0695b6841c8b SHA-256: 5af570350b5c4ec3555d43f6eba2e4cad7b20769b32a48f832515479b20b2ce7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=how+to+make+money+in+simcity
    • http://abwlargo.com/uploads/files/23926331763.pdf
    • http://kleinschadenexpert.com/userfiles/file/39257273731.pdf
    • http://gdfsztal.com/uploadfile/files/wudekitij.pdf
    • http://ingmarcofaedi.com/userfiles/files/79248023444.pdf
    • https://al-farh-iq.com/upload/userfiles/file/wexuvaj.pdf
    • http://iburgisidimarsala.eu/userfiles/files/gufibifeketera.pdf
    • https://nordiskvillaventilation.dk/userfiles/file/velutatet.pdf
    • http://kcpsystem.com/userData/board/file/65365185794.pdf
    • http://elitk.ru/_files/53461649073.pdf
    • https://ubk-sad.de/azubi/userfiles/files/3819631076.pdf
    • http://tatagz.com/uploadfile/files/vidutixi.pdf
    • https://hunde-katzen.at/soubory/27614987205.pdf
    • http://altaprecision.com/userfiles/file/11331986992.pdf
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/91739558352.pdf
    • http://topenglish.sk/app/webroot/gallery/files/33025757039.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/29659674548.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615cc14bdeaa0---12277780733.pdf
    • http://goldenpeak.it/userfiles/files/jejefawozer.pdf
    • http://compow.net/ckfinder/userfiles/files/75570592353.pdf
    • http://esteel.my/userfiles/file/ruguw.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/govotinu.pdf
    • http://theprofitnesstrainers.com/userfiles/file/wutupaduvaketuse.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_off0000dd66.bin
ddde6dc180bdde4e0bf88613a55c624fdeea35e5f0074cfcf4f8cebb52f55edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 17600 bytes
font_01_sfnt_off00010ad5.bin
7f09949078eebd7f0cd44f751717f820f2e95109b0404c5129ada311fca681b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 10528 bytes
font_02_sfnt_off000122e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes

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