Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13f5b081a31f424…

MALICIOUS

PDF

96.8 KB Created: 2021-09-09 04:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ac95fe808eb4360a1886d7ad71e7a2b SHA-1: f7ad8817d589b743613d455f29ad1696284c4e8c SHA-256: f13f5b081a31f42484996d35ae3c1d632c9fc370b8865bb18300ea1480fd76c0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=example+of+spreadsheet+application+software
    • https://thaiahpa.com/flash/files/30460066044.pdf
    • http://gostinica-domodedovo.ru/files/duxasunisalir.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/6841756922.pdf
    • http://jumpinfit.it/userfiles/files/39972418287.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/paronijabarovowegive.pdf
    • https://abzesolar.com/uploads/files/tabidutokabumopev.pdf
    • http://skulpt.in/admin/uploads/file/1579719203.pdf
    • http://ossokahve.com/upload/file/batibuvigadazuweseful.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/zasatefa.pdf
    • https://tch.lu/files/files/dufet.pdf
    • http://mesterteto.hu/userfiles/file/39350104436.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/buzenu.pdf
    • http://tscyw.net/userfiles/file/20210908121333_zz8dcm.pdf
    • http://ipceurope.eu/assets/file/suwalusez.pdf
    • https://cingenito.ca/upload/editor/file/12371844436.pdf
    • https://cpsguffanti.it/uploads/file/45114499922.pdf
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/61740561431.pdf
    • https://nepalonetours.com/userfiles/files/rigibonasubamizedewinezu.pdf
    • http://myphamlulanjina.com/upload/files/bolel.pdf
    • http://gachbinhduong.com/upload/file/kinuxapotoneza.pdf
    • http://registermycompany.in/admin/userfiles/file/61269451578.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/99147118722.pdf
    • http://jfac.kr/ckfinder/userfiles/files/dazibusefe.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904203256.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_off0001132c.bin
d2cf1ff36feb388b0ecf25e480e1b714cdf2f140f378dac86169c7d7232fc4cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 18636 bytes
font_01_sfnt_off00014408.bin
d94ea52c3fea9552b208f12aa9deb8e97eabafb22da325e913e1763993fb355c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14408 11056 bytes
font_02_sfnt_off00015da0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA0 16792 bytes

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