Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b535e5aeba6aa5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 22:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8af269cddd1f99da841736c41657397e SHA-1: 6829a623b1b7f9f0dbc6dbbf91ec30a02b96e58a SHA-256: 92b535e5aeba6aa5b1d29484c2411f8264fa72a75b4a4f1c685e7b98aedb1414
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs, many of which are unknown or suspicious, supports the phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nileagriculturalindustries.com/file/3057638100.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206a7798d---duzodirilodisujugunesewuw.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/ditenisep.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/xufuvuvanebilutarib.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/gutowalemimezuxonuziju.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910130433.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/74851484298.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/611693184.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kepuv.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/76868166467.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219419521.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/sexosajamod.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/plutplj15lv2emhf5vdotv0n56/fitewotesunesemejevelekix.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/61144673223.pdfIn PDF document text
    • http://saktigroup.in/uploads/55015662181.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/darafidugimakaduri.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/28606433772.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/pobib.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80476273763.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/34887753819.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/95924141655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=parabola+factored+formPDF link annotation
    • 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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 18452 bytes
SHA-256: 92bc5b438bf07b1790506a7fb605bb1eb85db7c1083ad9820bb364e331f6a1be
font_01_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10416 bytes
SHA-256: fd27f097925c955e4c8309f33bbe91336f061861ba14ebf80eae63ff9aa9e4a2
font_02_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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