Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1f009ecf2d4e0c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 07:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 258989cc6f67a70c5ee6216b98603372 SHA-1: 38511bfd5041784fa1c7da4fb50b44cd9419ebd5 SHA-256: ac1f009ecf2d4e0cca128a34a1f2c8a14ba1a5c6d9fe0c04b88d6b2261dd4eaf
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 external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of embedded JavaScript, though not directly executable in this PDF context, suggests a potential for malicious scripting if the PDF were to be processed in a way that allows script execution, or if it's a component of a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=how+to+view+icloud+on+android PDF link annotation
    • http://steelbo.com/uploads/admins/u0/files/20210916185444.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7938768c1---valagewarowemi.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/dexikidezinozatipe.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/98106958127.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/tananadatatot.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/17248372.pdfIn PDF document text
    • https://airxps.com/userfiles/files/7019653484.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/32937112772.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090510354015886.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/21595371504.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/waloluwo.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/luvesunafigozoroji.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///59564222072.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/58764478385.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/lolazaxudokizedawe.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/85609311805.pdfIn PDF document text
    • http://grandfiltr.com/files/file/gedofamemepujazufifiwut.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9d90b7ac6ad41f2cf19b5d06c7024d67/xamimazedofojukadimiliza.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/fejimuzo.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/ketomerafux.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/relugikovagewikexox.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/lusipopipatuburito.pdfIn PDF document text
    • http://th-hl.com///upload/files/pewigumeze.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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10440 bytes
SHA-256: a982a68f8a3e9c7af52b302014c0ee61dc3dc29b36119e9cb25440a595cd5757
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 17468 bytes
SHA-256: 5939031810e63d8a0ae2e9f4f6d4e916fb74bf8a2ea401d60c8e6425697fde59
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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