Malicious PDF — malware analysis report

Static analysis result for SHA-256 de62e4dc9e70525d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 16:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09eac52cb7596b2fade9d0aa8b4857ce SHA-1: faad3f29c9501ffc708546d32b4e3bd680d87d2a SHA-256: de62e4dc9e70525db626840a84062a6c04fc3cb0a0915f298fd45358a31c9e68
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, indicating an attempt to execute malicious code. The presence of numerous external URIs hosted on disposable domains suggests a link farm used for phishing or malware distribution, likely serving as a lure for users to download the actual malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=una+corte+de+niebla+y+furia+pdf
    • https://gbagencement.fr/uploads/file/dokalarav.pdf
    • http://debeleven.net/UserFiles/File/7114574676.pdf
    • https://aprenda-atdi.com/uploads/files/70250150622.pdf
    • https://kuzeyilac.com/resimler/files/wesol.pdf
    • http://studiofantino.it/userfiles/files/18922986031.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/sorugat.pdf
    • https://f2h63c2.ip4secure.net/upload/files/56256248963.pdf
    • http://e-restauracion.com/app/webroot/files/uploads/files/jugixozadimofufagonigevo.pdf
    • https://itchanoi.vn/uploads/news_file/pakamajiroxif.pdf
    • http://cansuyu.org/resimler/files/42956249322.pdf
    • https://4wheelchile.cl/admin/uploads/file/84197373423.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/xawivibawad.pdf
    • http://mh-gartengestaltung.de/userfiles/file/lunemafimelafazifedebam.pdf
    • http://jakpaisanestate.com/images/upload/files/xekiwisivogokovanoreximo.pdf
    • https://fotoprint.lv/downloads/file/3185749738.pdf
    • https://interativacorretora.com/fotosempresa/files/99902143383.pdf
    • http://wixoon.hu/upload/file/riruvapi.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/dudovajiwevenuze.pdf
    • http://thedewakohchang.com/image/upload/File/igadewewevakona.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/62054806536.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_off0000c2b6.bin
79a7e704685f5f1cc1e9a03a392e79ef6fe1d9da42cc30a780103095ccde98b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 10808 bytes
font_01_sfnt_off0000db84.bin
dd176dc0903e0391664daeea671bb2593390a94c4f9b4a857b3fbe02290453b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 17204 bytes
font_02_sfnt_off00010680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes

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