Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fb1fe0b9ae6cec…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 322781a08839d7ee19c6368701829c72 SHA-1: 7faf1cbd7068d8b9eff4c777374ed1c8d8f3921c SHA-256: 23fb1fe0b9ae6cec1334361539ddb81d37d6f24464ba263fd7ec0ba49cab691e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+to+flash+my+android+phone PDF link annotation
    • http://ttccid.com/userfiles/file/34066966783.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vawinotewuxo.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/22949737069.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/79530069881.pdfIn PDF document text
    • https://harom.ro/files/file/26255360190.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pilovugowesuworug.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/3416191890.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/72422725132.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/9318886446.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/55852033123.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/68180546085.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/13451290540.pdfIn PDF document text
    • http://liyangah.com/Upload/file/zasejogagulikob.pdfIn PDF document text
    • https://fptica.ru/images/file/68218278134.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vivejagi.pdfIn PDF document text
    • https://finliz.lt/i/File/firexute.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/pozisiwipovesegi.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sudexogikumubazikimem.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/piwidezevibareguzufe.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/26202142012.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d71c4e8e---79089807910.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/91449031651.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210904035100_1032688078.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/28046026787.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e92d767e1---78439171526.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 10952 bytes
SHA-256: c61af2232f7780c224e7af5602501411e64ac346ad1c0a80f470c34ea8e87c73
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 17656 bytes
SHA-256: 27add4c6e1d146fabf43967eca10f913a5adbf454071b36feb120c8a5e0ad8f7
font_02_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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