Malicious PDF — malware analysis report

Static analysis result for SHA-256 22eb2f0a071b377c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 08:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fd4fbf1055d8f89e0a15e3c8bcd8cb8 SHA-1: 139fe9f1d6b74fb6a91bd89699049a64b44475f1 SHA-256: 22eb2f0a071b377c80f912e88bf969dbe613c840ad4fafed1631e878f2d2c815
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm on disposable hosting, and a heuristic indicating a 'download button' lure suggests a phishing or social engineering attack. The file's purpose is likely to trick the user into downloading a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=which+is+the+best+app+for+file+transfer
    • https://defi128.phpascal.com/userfiles/files/41402972583.pdf
    • https://tarsiman.ee/files/file/66080101325.pdf
    • http://kahounova.cz/userfiles/file/32989889612.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210909_42175328F4485361.pdf
    • http://falconfam.com/ckfinder/userfiles/files/tulafutinanebu.pdf
    • http://edins.net/userData/ebizro_board/file/27690992106.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082c7da9fc---sutadofagolikimimuvatu.pdf
    • http://cokhilegia.com/upload/files/98218224781.pdf
    • https://letstravelforacause.com/miet/assets/files/58093269659.pdf
    • http://resheto.ru/users_images/fck/file/sutexemafuzurusemoruwipaw.pdf
    • http://hvpeds.com/upload/contents/file/6076116838.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/86400771610.pdf
    • http://ehoron21.mn/uploads/files/virufek.pdf
    • https://profession-your-dr.com/uploads/files/202109140635374008.pdf
    • http://salon-urody-bellis.pl/images/file/koxedu.pdf
    • http://travellightnepal.com/userfiles/file/gaxumosazewuterozokomas.pdf
    • https://gadd-asso.org/userfiles/file/62037515594.pdf
    • https://cobaltinc.org/userfiles/file/39341179276.pdf
    • http://celesteandtorsten.wedding/images/file/55631391580.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/65162281520.pdf
    • http://rigosarchitects.gr/userfiles/file/43186850427.pdf
    • http://oilspecchem.com/files/74627886741.pdf
    • http://hanasushimenifee.com/uploads/files/buparesukeselibipawop.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_off0000d1fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 16792 bytes
font_01_sfnt_off0000ea10.bin
fb07d2821c309aef91a67956833f8c03a560ddf0c788c6c8d80271ed424b019f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 17468 bytes
font_02_sfnt_off0001178a.bin
dd57d114a6422bca67b5cdeb2dbcc3518a303904141a1eeb1292e853a40af497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 10708 bytes

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