Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a304d9b84145ea6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 12:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc0b327a5808d86ca90dbd398b50797b SHA-1: eef2900801f8594901f3d982371f9e5fc588701d SHA-256: 8a304d9b84145ea6b42d5a658f90313512c5bb309b267ba93012c7877b1d713c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains multiple embedded URLs, some pointing to IP addresses, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common technique for delivering malware. No scripts were extracted, but the presence of multiple links and the password lure suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22223783646.pdf
    • http://chokmanee.com/userfiles/file/86439022085.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/59069215623.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/69596308641.pdf
    • http://marikitaberbagi.com/userfiles/file/luduvemu.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pk9ni84vceblfqem7jr3egrufo/49993417746.pdf
    • http://ankaraeksioglu.com/resimler/files/fomekevapanimuvumunibid.pdf
    • http://kfoodntea.com/dataroom/file/lizesuriw.pdf
    • http://www.amedna.com/userfiles/files/79364563204.pdf
    • https://saikekanglun.com/filespath/files/20210908120900.pdf
    • http://quatanggiabao.com/images/uploads/files/13560440448.pdf
    • http://karthikeyanjayaram.com/userfiles/file/vofimol.pdf
    • http://157.230.241.115/image/upload/File/30649361281.pdf
    • https://hankilfood.com/upfile/files/54865882128.pdf
    • http://shepardinteriordesign.com/rw/upload/file/92096804740.pdf
    • http://lianbang123.com/uploads/files/202109051350364066.pdf
    • https://architektor.ru/uploads/file/67903438146.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=4ukey+for+android+with+crack
    • 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_off0000cfd3.bin
41aa380339f681e2bf093b6928531d36da34df51ed9b50341aea220f30c56adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 20224 bytes
font_01_sfnt_off0001048d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 16792 bytes
font_02_sfnt_off00011ca4.bin
505cf71555e7f19167fce397753107feaf46da4d769cdcbbb13aa82087b577ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 10732 bytes

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