Malicious PDF — malware analysis report

Static analysis result for SHA-256 05acdb585e394ffb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 12:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c93d0fc32a08be0d176094b1619975ac SHA-1: 92e6cbdd7ac466fe5e215bfdc5329f6bca1ef9c1 SHA-256: 05acdb585e394ffba5af7a6a6fdfb5bcd9d7e41780cc43e781ea6f3fe1f3c1ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to potentially disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bawaniint.com/ckfinder/userfiles/files/77174633914.pdf
    • https://maxflowfans.com/userfiles/file/jopogokimovexofix.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580f7bae3d---wugifasajigaku.pdf
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/20823239909.pdf
    • http://studiotecnicopinto.it/userfiles/files/6971019474.pdf
    • http://maturitni-ples.eu/UserFiles/File/lukuzuk.pdf
    • http://preiss.at/upload_files/files/6942913445.pdf
    • http://soldearenales.com/galeria/files/84422571154.pdf
    • http://abworder.com/uploads/files/16938338753.pdf
    • http://studiodrago.eu/userfiles/files/tisenajifiwomafujo.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/90918071846.pdf
    • http://rosniyom.com/userfiles/files/9574648420.pdf
    • http://agama-rc.com/upload/files/64469177652.pdf
    • http://pomocnaukowa.net/Upload/file/xegapurenadigebanusesixe.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/61781312540.pdf
    • http://wx-test.com/upload/ckimg/files/202109141824116850.pdf
    • http://leaguengn.com/userfiles/file///xegabumu.pdf
    • http://sxhk365.com/uploads/file///89681667940.pdf
    • http://sinice-rasy.cz/files/file/26425298584.pdf
    • https://sweetburden.com/upload/users/files/6051136270.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d355028a15---wamesuvifojefiso.pdf
    • http://reckdance.pl/userfiles/file/lolegevotid.pdf
    • http://smelawservice.com/file_media/file_image/file/simaxokudepuvag.pdf
    • http://sieuthicayxanh.vn/webroot/img/files/golamilovu.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/didarajudatajefiduru.pdf
    • http://mottaing.eu/userfiles/files/bexaxizulavid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=screenshot+template+android
    • 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_off0000d979.bin
67c642e4c941791a67297e6b3909b50ccd1446417308b02f5bda301fb354df67
pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 10852 bytes
font_01_sfnt_off0000f247.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 16792 bytes
font_02_sfnt_off00010a59.bin
659f6c15708a680e5b1590a41467693febe6d92d352e77f44d177e383ebb1b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16616 bytes