Malicious PDF — malware analysis report

Static analysis result for SHA-256 f335cda60a77f4b3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 08:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20cc7ed61b701f1a0aa65b4f7977f30c SHA-1: 806f92292f32a46fa9e6e016994f9dca9251022e SHA-256: f335cda60a77f4b34e8c6e8281047bf43fd8f0138dc80eb1bbc752e3d494a715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=how+to+see+who%27s+connected+to+my+hotspot+android PDF link annotation
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/78648929187.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/810977456.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/wetatavabapojagelikamaloj.pdfIn PDF document text
    • https://kokomanis.com/contents/files/simenozaw.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/91493732615.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/41987547225.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ha7670d4nf3ubpfevh2etkvju6/losopuzujerekigetato.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/jojosurelidesegu.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/72058781908.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/suzimedabagasajovofo.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/walatavisuzak.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/vusewatexewa.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/siredanilokigube.pdfIn PDF document text
    • http://peoplefoster.com/pliki/vorabumaxitafubofef.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/69439212957.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/97059446046.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/1674897344.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/28662668551.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/jitijopawulupebeta.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-8/20210908025046911285.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef4a6314c---28238690368.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/tosirinuwovefe.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/kezuz.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/zaxakagu.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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 10956 bytes
SHA-256: 54d871d145be87980e0528b3def0dcbfb6c88afaf31fea4579d73794f150eadc
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 17608 bytes
SHA-256: 1950ed40b20e5b85dfb90f365a439e9c0fe50a0139d2a6a4fdc7f0feeff4d6ca
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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