Malicious PDF — malware analysis report

Static analysis result for SHA-256 653b0ae4cd6ca363…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 01:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2133fdc9b6d5938afec5d717c3e0d88 SHA-1: ab7b754f87dbd425845a22bad4f4aa5c45d80d00 SHA-256: 653b0ae4cd6ca3637f0e5ec50c0469c2e4d92734d179d24c8ea9173c2fd0267d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs, including one pointing to 'drafthe.ru' which appears to be a link farm designed to redirect users. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=privacy+guard+android+apk PDF link annotation
    • http://modernplating.com/userfiles/file/21973331435.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/kuxasifixez.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/jizufurunatudijilixig.pdfIn PDF document text
    • http://skrn.cz/pic/file/godemux.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/59139596165.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/4056100231.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/76174929559.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/nijepodi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/33011826768.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/sobuxof.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146624c72fdb---88495711982.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/42841993335.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/6745601650.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/gusogunofopoduto.pdfIn PDF document text
    • http://olympusflights.com/files/files/62491835835.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/97498662621.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/xuwozuwem.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/48334319178.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/tutirojerewat.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/nanewuwusajefevaje.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/delafoso.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/15534756161.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/jofejanegobu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/vejeriwawebetoselupo.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/ridobuzizaxog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 10620 bytes
SHA-256: b513c8e60c697fdce92f1d51b3c8fc8479fc68d96b907545f325eeadf1174425
font_02_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 16820 bytes
SHA-256: 03373051bbcfc9535ab064eca13bd844c42f0d31548579eeb7c514492d5c2382

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