Malicious PDF — malware analysis report

Static analysis result for SHA-256 db968713d978c63d…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 08:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19d36e8508ba3b547197d975876d127b SHA-1: c26cbb6bbddd21b495211dd32a8a475004f1cb0f SHA-256: db968713d978c63d078ed26ee2b631136842b269597f3375c794723731db6f68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://inwebjor.ru/uplcv?utm_term=watch+conjuring+3+full+movie+online+free PDF link annotation
    • https://mgs-on-track.com/uploads/misc/files/rejepumojowegamovede.pdfIn PDF document text
    • http://carbontuning.ru/file/ribijujake.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138c25f17d39---31739088115.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/55328491120.pdfIn PDF document text
    • http://sin-hua.org/userfiles/35780762740.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/34399753720.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210909021001.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/widov.pdfIn PDF document text
    • http://metallpress.ru/files/48100054196.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/76408824984.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/83296883151.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wologinakonegipugikebuk.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/vanodunuvasiwujoputima.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/fapepixakujogenabobi.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/besevafirotusuwudadabi.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/letepipovazave.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/55770445337.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/fizuxubekijoxomixigon.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/61239011419.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/84720100597.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/jegamiwiwel.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613419222541f---ladikanezebupobop.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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 11076 bytes
SHA-256: c58dfa8e5a460d270b91d00eef096a0c5b88948faa9099793655b013990f86f2
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 17596 bytes
SHA-256: dad10863188cee29ee3b9834c7d818f1813342f94bf006a818cc267b22a1d2c9

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