Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a0b63db0f224a8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 09:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8eda04c3b9d5e7e178fe32bd57aca77 SHA-1: 9ce6e07b28f70c5db4729fb1f20fb35f9c123213 SHA-256: 78a0b63db0f224a826dcf6207499cc6d795154c1f336df7daed3079b51d81f5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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://medvor.ru/uplcv?utm_term=no+play+store+app+on+my+phone
    • http://www.grupoaccs.net/ckfinder/userfiles/files/kapemobodejalomuduji.pdf
    • http://fsgzb.com/upfolder/e/files/20210904172145.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210910_280034B58D282418.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/kowuw.pdf
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/91458147695.pdf
    • https://sieseam.org/userfiles/files/lobas.pdf
    • http://klusjesindex.nl/images/uploads/vevunomojes.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/40518429234.pdf
    • http://ing-ka.com/user_img/file/13224384818.pdf
    • http://ristoranteyuri2.com/userfiles/file/54564572312.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569879a0bf---pumimige.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/tabesitiwaferofegenosituw.pdf
    • https://yukkumpulgroup1.com/contents/files/40502580714.pdf
    • https://mondoaudio.it/img/uploaded/file/gikijonidowa.pdf
    • https://seedcambodia.org/htdocs/cljr/data/files/muxizamuzo.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/vesad.pdf
    • http://sotel-perm.ru/site/file/zazadiwisivuvofosoj.pdf
    • http://nbnjl.com/userfiles/files/fojevugiw.pdf
    • http://drapa-technika.cz/UserFiles/File/33109917564.pdf
    • http://costruzionibulagna.it/userfiles/files/fikuk.pdf
    • http://yuanhebiotech.com/upload/files/xuwuv.pdf
    • http://klgd.spokoino.ru/i/upload/files/89292311919.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210911_4BE9D39ABAA33AE7.pdf
    • http://weorderfood.com/uploads/files/41354545451.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/puxaruzavovowalizifax.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_off0000e4f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 16792 bytes
font_01_sfnt_off0000fd0a.bin
d796b49259f5ca985516029f203f72ae96e3f45d1645b9c15ff3471efb897f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 18176 bytes
font_02_sfnt_off00012bde.bin
ee24b86f1aa685361019af4ee4bf6475431a6b28dc353378481ffe10c428cac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDE 10516 bytes

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