Malicious PDF — malware analysis report

Static analysis result for SHA-256 4214e4e40384d989…

MALICIOUS

PDF

77.5 KB Created: 2021-09-25 07:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61d50ba9d145dec256211f8b65a8a41d SHA-1: e6365660264af02ed8c46e90dd7dc81a28887ef3 SHA-256: 4214e4e40384d98987d1861edbb87a754056ea691c155a83f5fad8ae8834c9f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as phishing. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for distributing phishing lures or second-stage malware. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=bca+internet+banking+android
    • http://gallery4walls.com/upload/editer/file/40984535959.pdf
    • https://minhvuongthuphap.com/upload/ck/files/takafop.pdf
    • https://cribpointonline.org/cribpointonline/userimages/file/30949468055.pdf
    • https://giaphutelecom.com/tctt/sites/aaa/file/50049463322.pdf
    • https://dollarplus98.com/images/upload/files/tozuminikurusudetovawagot.pdf
    • http://ajk-opakowania.eu/upload/fck/file/mejifoduge.pdf
    • http://baozhaopharma.com/upload/files/nimenovaboxikevojewimi.pdf
    • http://billedbutikken.dk/articlefiles/file/87029046600.pdf
    • https://arerp.kr/data/file///93576297047.pdf
    • http://frangarcia.eu/upload/file/zirinawixemuneves.pdf
    • https://icon-studios.com/userfiles/file/72961514302.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/setimabupixuvexurixesosap.pdf
    • http://aztkgbv.love-mrt.com/upload/files/83474668824.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/xarativigepapazojadaw.pdf
    • https://kaparatt.com/images/File/nujabiderezufekataletiso.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dikuro.pdf
    • https://www.nvsrolko.org/ckfinder/userfiles/files/29870237190.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613079b439449---tomoduzazu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614142549a97f---vujarifefedudetoletuxaxus.pdf
    • http://hichipper.com/hichipper/uploadfile/file/2021090916470173499.pdf
    • http://archive-2013.humandoc.pl/attachments/file/febiziripa.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/12831656471.pdf
    • https://tort-art.ru/userfiles/file/piduxajuwotofud.pdf
    • http://wonsakai.com/uploads/files/77976414833.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_off0000c370.bin
bc35b3dcd4c9bd7e64a979d404928ae993b1480c12e8091e8029d262f2c080a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC370 10616 bytes
font_01_sfnt_off0000dba9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 16792 bytes
font_02_sfnt_off0000f3bb.bin
642b446390b1a61a8bf9b0e6ea226a871c1c547bc949fbaf6b89a942b2d2ac71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 19960 bytes

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