Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa088e4dec41749…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 01:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de24847889d6b49e76171cf06661de8d SHA-1: e083c0132be952e216c270233602370be5e608e3 SHA-256: caa088e4dec41749fdd5e47a59695b1b3c397b4d1a4de0018a784db25fc00423
186 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to trick users into revealing sensitive recovery information. ClamAV also detected this file as a phishing trojan.

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://crewmak.ru/uplcv?utm_term=roblox+demon+slayer+rpg+2+codes PDF link annotation
    • https://alshuka.ps/ckfinder/userfiles/files/lovirawota.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/65212246664.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/zegojenadogukawove.pdfIn PDF document text
    • https://wecareprogram.org/images/file/8172098192.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/xigufonev.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/dumelu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/42481977981.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/xogisilofusirezewulekidi.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210903100538.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/xuzuvomavizos.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284968183c---15527689505.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/rufinule.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/juxogef.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210919_170040.pdfIn PDF document text
    • http://strahyi.ru/images/file/mejotudasinibobot.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/62094267649.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/rekowi.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/zezefesamuxunulupinodu.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/modibipomorafikeg.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/45322163790.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_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 11188 bytes
SHA-256: f6ca60044f36f8f240f92dbf0ccd3f9c9898a23ab374644f9a8c594d3a60f79f
font_02_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 17620 bytes
SHA-256: 76df34c870df0b34a30d919ec81405e74eace692a23734b984f3df1c99acc9fa

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