Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ed3995c0c250d3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 10:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9f1e4bbe2abbbf39d14dc73e3dbbf426 SHA-1: 5e8648fbf24ab081496cb51c770ec32dff7fda47 SHA-256: 83ed3995c0c250d3f0ae815cceaad737729437ba764760b6663dd657c06771c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and a heuristic indicating a deceptive download button, suggesting a lure to trick users into downloading malicious content. The presence of external URIs and link farm characteristics further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=kimetsu+no+yaiba+movie+online+watch PDF link annotation
    • http://vincitydata.com/uploads/ckfinder/files/53521628997.pdfIn PDF document text
    • http://ihdbd.org/upload/files/35066506166.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/ziwavovirux.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/mumofesom.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/zerogejulusilobivarumu.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/vinudaw.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17dd2228f---sixomutixukipot.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/kopokifejijizebiv.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/69201926189.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/fixila.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/baxesovumal.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/d86f1a1d876d1132ce21c11299f28a11.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/dizojetilozegabutu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/walovubiturakifoxe.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/komunawudonuxeki.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/72094198356.pdfIn PDF document text
    • https://kultmotor.hu/images/files/suwabikebuwetolaxalo.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/luwowezixitijurupebewoxu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/mejif.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3fca6934---8017296033.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sigofile.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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 18056 bytes
SHA-256: 3c07afc6f5a366326c79351b6872b7df751a0dc20fee9a54c61cd8d9f220f79a
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 10892 bytes
SHA-256: 73e7624590fdc8a8a8c8d4779d22761d66ea0f2b0ca4e657d9d21dc980c80ff4