Malicious PDF — malware analysis report

Static analysis result for SHA-256 06584b8b1c94c225…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 04:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9f9ef6ce2deac7a33efc5db3cf964b2 SHA-1: 3d906af03346c7396b8ef4f81fbd45681f919a5d SHA-256: 06584b8b1c94c225f203cfb3efe0b3ac67917f1f426f42ea676b34c09acf0561
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, hosting numerous links to external websites, many of which are on disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=android+tv+visualizer PDF link annotation
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7645552db10e9b12eeaeb0581a72e27f/duxotisigefifojodizi.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/15404349036.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109012328415619.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/ribisu.pdfIn PDF document text
    • http://kezheng.net/Upload/file/sadajulelijodi.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/50432407244.pdfIn PDF document text
    • http://coachhouse.info/assets/file/89549926970.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/dadakirumu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/93590033005.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/34570728296.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/22709440801.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/fesajaninofanugujaxom.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/96454971254.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/66055564659.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/26406933413.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/78799470749.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/54811273673.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/75457304480.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/53644096679.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/72427715383.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/5198349125.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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 10448 bytes
SHA-256: b41c2d06e0cd9811256cbc21653b123b12b55d10109449412c424c07cf859387
font_02_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 17336 bytes
SHA-256: 92660572e422124765a02c97a320e76197653a57ad109fbab181a93279e061aa

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