Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f3fa7f008041f0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 23:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1efcba121cb7f48f3199401859380f02 SHA-1: 1ed6da77c0f799434d5425230df8efbbb8f51f8d SHA-256: 56f3fa7f008041f0a64e45eff0e5783efb9b421266ff8924687207aac420a0c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external domains, suggesting it's used to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to exploit users via external links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=android+set+package+name
    • https://chameleoncoupons.com/adgprocessing/uploads/files/vipujuzinozigonoxo.pdf
    • http://barsugo.com/ckfinder/userfiles/files/87034976891.pdf
    • http://revucue.com/ckfinder/userfiles/files/97501489449.pdf
    • http://dgelc.com/userfiles/file/20210902155738.pdf
    • https://ccaquebec.com/userupload/files/zerilitikusuwesukub.pdf
    • http://weorderfood.com/uploads/files/jopupemowuvoketu.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/nanufesojuxono.pdf
    • http://apexibd.com/uploads/fck_uploads/file/lezejobapo.pdf
    • http://pizzeriagiganti.ro/imagini_ws/72489632233.pdf
    • https://jamuiboe.com/webroot/upload_media/67131605771.pdf
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/47820921743.pdf
    • https://muguet.fr/sites/default/files/file/45829581792.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/30215366025.pdf
    • http://agriturismoilnoceto.com/userfiles/files/butevufok.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/61399464535.pdf
    • http://skupka54.ru/upload/m/5791776175.pdf
    • http://koreabulk.net/userData/board/file/vawaw.pdf
    • https://classconnbio.com/img-jacson/files/woxaluporotep.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/34082478511.pdf
    • http://hublihorse.com/uploads/userfiles/files/52632520593.pdf
    • http://sacmacbook.net/userfiles/file/wiguvum.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ba87f6f0---tulupujulak.pdf
    • http://rockycheng.com/ckfinder/userfiles/files/66465609860.pdf
    • http://herborgthailand.com/file_media/file_image/file/zuvela.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/sekifuzipega.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_off0000def5.bin
1b673f2f28f62870135f44260e3688d499e237385960f035e46fdf7225eeb75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 10884 bytes
font_01_sfnt_off0000f7f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 16792 bytes
font_02_sfnt_off00011009.bin
02391d65c49cbe1583609e02ae2d2977354f01589ed0db2b7bd0ee01df66eaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 19708 bytes

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