Malicious PDF — malware analysis report

Static analysis result for SHA-256 3283c7e8d3311902…

MALICIOUS

PDF

80.1 KB Created: 2021-09-24 05:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5315d85c455443b468b74e24d245771e SHA-1: 5f8d07c29dd5c1039464b8e247f3f1406e86b212 SHA-256: 3283c7e8d3311902291424289616722ba7dee0690ece8750be8d118c79f64bb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it's a link farm and contains external URIs. The PDF structure and numerous embedded URLs suggest a phishing or malware distribution attempt, likely delivered via spearphishing. No scripts were extracted, but the presence of many external links points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=wrestling+3d+apk PDF link annotation
    • http://tramtronbetong.com/uploads/userfiles/file/rikitevitabaligaverutewi.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/zevabuzerokoregewolojul.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/27054302021.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/41637459533.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901161003977286.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/50272812616.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/24581486733.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/numelojisad.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/bamupezoj.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/86610692907.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/78375313558.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tobofujilofojulofine.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/rabedukojaderajonejabig.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/jinemanozototubosujof.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vopinaf.pdfIn PDF document text
    • https://sergiomauri.com/images/file/72889727480.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2e273a701---tanax.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/31466216188.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/44878342212.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/vafojesukisunujiwunija.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210919_034418.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0702833020f720b916eb5cf87affa1ca/84269390724.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/61713258954.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/mivedetejugazibojukorono.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_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 17668 bytes
SHA-256: 55eadd562062dee8e456624d0515e659009f1873cc0d5038dfb881f2dfdac57d
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10704 bytes
SHA-256: 2d8475569e96e23692a9a390e4de7b86b1ee799d5644e9940acfba1ae310b2e4
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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