Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a03a6366e6b81b6…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 01:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ef9d8fdf0c9eef27fdf8c194bf0914d SHA-1: 28eb6b823dcf7cdeb9ecf783aad73e276b2b6c30 SHA-256: 1a03a6366e6b81b6edad58118c5159e7ccb5c37d57c1a33f94ca077aeff91a50
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to external resources, many of which are hosted on compromised or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to decrypt an archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://philabc.ru/uplcv?utm_term=broken+phone+screen+on+pc
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bevaxavurekogoki.pdf
    • http://96stone.ru/userfiles/file/demirogeziwozodemitipe.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/pagalabozulolodo.pdf
    • https://seedomoretravel.com/files/files/50161254648.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd7711720---xejavulilokafo.pdf
    • http://philboyd.com/19456813224.pdf
    • http://wiskind.com/filespath/files/20210910194851.pdf
    • https://hotnews.md/upload/userfiles/files/vuzikozowo.pdf
    • https://sinarlangit1.com/contents/files/20574953328.pdf
    • http://stonestudio.pl/files/upload/file/dukotobizosuvukekila.pdf
    • http://polyacer-ecp.com/userfiles/files/20210903_130031.pdf
    • https://mumegram.com/userfiles/file/zasomunezivejarobexaz.pdf
    • http://fittbikese.hu/files/file/pininopalimopebopibapen.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/winibebapozejojepinef.pdf
    • https://hashtag.school/userfiles/file/65342283503.pdf
    • http://rideabikenews.com/user_img/files/43156705336.pdf
    • http://helder-effect.nl/userfiles/file/26015955896.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132229591251---temeruxumoloveremo.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f03fa338d4d2e0abe857995e07109e3f/kexuwubuxazeragenele.pdf
    • http://santehnika34.ru/images/file/tidufewozisepifateta.pdf
    • https://bliznacite.dvsportbg.com/files/bodigarategurukubosimaxa.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/24c9313ec8f79dffe773b505b0c0fa7f/tiweponefeku.pdf
    • https://villadelauca.com/userfiles/file/37003194351.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/38065984483.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/47935455934.pdf
    • http://yuhenganquan.com/userfiles/file/20210906194820_1385679015.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_off0000ef98.bin
fc3cbcefd7f646381464776b5734339092fbc84e90b8405154d61c3896dcebee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 17892 bytes
font_01_sfnt_off00011d4a.bin
2b381af1a1c92dd5db4f69f1b009488f9617780fc95cc072ace11adefe155f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 10220 bytes
font_02_sfnt_off00013429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 16792 bytes

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