Malicious PDF — malware analysis report

Static analysis result for SHA-256 038f0c413950a922…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 10:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67c753b9e6ae2933afa9baca0871c56f SHA-1: 9eeb46344ed969b62a7be2c15b50d28beedc85d6 SHA-256: 038f0c413950a922ac153b129730137b43c4aa1924e7737bde7539f91c60acc1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway scanning. The embedded JavaScript and the nature of the linked PDFs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=screenshot+android+phone
    • https://casasholidays.com/scgtest/team-explore/uploads/files/zojoxefetetobep.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901073443489631.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gukux.pdf
    • http://thebookmarkcafe.com/uploads/files/46560410957.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/58950010780.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c3850b0ea46739872efdd2caedf9907/jetora.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/xofupatatemexafuridef.pdf
    • http://king-pro.com/userfiles/files/31959494613.pdf
    • http://firegallery.ru/img/upload/90875757384.pdf
    • https://ikomsolutions.com/admin/userfiles/file/wetalipi.pdf
    • http://studiospazioambiente.it/userfiles/files/33277347171.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/92872283285.pdf
    • http://tetobox-budapest.hu/uploads/files/3130401641.pdf
    • http://evo-models.com/uploads/userfiles/files/bonadibetikeg.pdf
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/31971257489.pdf
    • https://serka.com/serka/upload/files/getajo.pdf
    • http://spartapr.com/images/upload/file/50067327551.pdf
    • http://www.contal-farmer.com/uploads/files/70211713390.pdf
    • http://aven.su/userfiles/file/zizizakajarosexabave.pdf
    • https://fertilizerproductionprocess.com/d/files/71713150303.pdf
    • https://detector-billetes.com/Imagenes/file/puronoj.pdf
    • https://mtestbd.com/assets/uploads/files/bikuviroxazivoseda.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/rigufosudok.pdf
    • http://zafirkort.com/uploads/files/71963932155.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/33858649726.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/momenegixulufilovimew.pdf
    • http://www.specemc.ru/upload/files/96860111974.pdf
    • https://myreply.mobi/snappshott/editor//file/67012479159.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_off0000b5b3.bin
e3d2d8fb1bbdae5472f91fc170612eac471e856b08c3010eaef9cf0c7a7d1a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 14616 bytes
font_01_sfnt_off0000da12.bin
ec91786cb38b3940d4cad1c918ff3dc0ef46888c626c49d21b3f86f864519060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 10640 bytes
font_02_sfnt_off0000f252.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16792 bytes

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