Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad78f7f054cd93de…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 16:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 725f805c229eaf134e657d7a5f9f1dfa SHA-1: cd8dd9958cabdf5b3ca8df1e0d0adbf6adebdfe2 SHA-256: ad78f7f054cd93de4f8af1609779d46fe54da2b89d9c98f7c16d0898d6d7745c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=android+graphic+equalizer PDF link annotation
    • http://teraval.cz/res/file/bewisedoveda.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614614de9a88e---22873481209.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/xifexitaroduluv.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/27398015208.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/vibarogul.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gegowoluz.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/jimonawowufagozawu.pdfIn PDF document text
    • https://nevisnews.com/userfiles/15813239427.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/29534714808.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/54505623159.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bijakutedikumawikar.pdfIn PDF document text
    • https://alpinashop.bg/files/48136277883.pdfIn PDF document text
    • http://enricobarraco.com/files/zefebufapesuxapoveroma.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/80163149926.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/ripejixatuw.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4e8c91b0e2e22a59606035dadc33af68/berijidoni.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109060647574658.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/79032643848.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/76673843915.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902092128.pdfIn PDF document text
    • http://henca.com/files/details/file/63972336264.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/bepulomot.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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 17560 bytes
SHA-256: b7fb9b942d379c6887e018f65d9bce6d9c5b1436b5e407119d966c98830c54a3
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10816 bytes
SHA-256: 9c835c964b190ebfbbd23331bffab2ec876a694e3f46af25ccea7bf0699cbf8e
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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