Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd3282ffbf9c1a4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 08:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7fa27830600474beed08357a4b48ab40 SHA-1: dcab9cb1ea6d6646daeb043bbdd6f591829fe1e0 SHA-256: 5fd3282ffbf9c1a4eae9cea46ea7768f98bf4dc2e74934a092e1364c6307c4ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=chal+mera+putt+rdxhd+online PDF link annotation
    • http://numere-mopede.ro/mm/file/1427662500.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/20179514916.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/8202674924.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161335ee0b1c5f---sedixenizedelivapu.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/92881611965.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/govolibumojuzew.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/witudigat.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1quk8qit6p6o3f5epms5m9fues/93270671173.pdfIn PDF document text
    • http://schokofontaenen.de/idata/13373947239.pdfIn PDF document text
    • https://europartner2.pl/uploads/refotodebonidekegitub.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/25027381345.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/21135491424.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/68869878348.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/22471617123.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/70127072921.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/92011969687.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/49456076065.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/jakeketatef.pdfIn PDF document text
    • http://dd-eng.com/files/files/domabi.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/64817776877.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/wowejawebulepebi.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/gixuvubeperijopusagare.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/69834789173.pdfIn PDF document text
    • http://hoachattn.com/image/files/vogadurududukaduv.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_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 10720 bytes
SHA-256: 80fef9d8b978fd9307e645f83eab1f0c88c073f570f6d1494a39302f2a563ef4
font_02_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 17736 bytes
SHA-256: dda2fbd8b148df75c88ca658016f13f81100a9af2eb34b59296ab307fe259f66

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