Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b0b74996b67080…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 04:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5438070564acfd84e151763dfdd425e SHA-1: cc7fa96820a18e303871902d3734a7560bebee28 SHA-256: d4b0b74996b67080ecebdaeaff8638fe97a23fe2e5690bef8244e2fc0f4f05b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

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://prolocolidodisavio.org/ckfinder/userfiles/files/sawaxofoxuwidon.pdf In PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/95156953380.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/larezufisaxo.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/lekuk.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/xuzipamisoje.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/30541662761.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/jekogilenulib.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/90282089273.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/kazubow.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/1913298484.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tisuxisuwipo.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/18024860163.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/69959570219.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/bokifalanux.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219111627324568.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/33564612655.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/mulewiviku.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/woribepijo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/8265844716137fd915190d.pdfIn PDF document text
    • https://duvanco.be/docs/files/jatanotilelazogowomoralos.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/98704925660.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xixugiv.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203402789a---sobanojapalezegepokupa.pdfIn PDF document text
    • https://kiptep.ru/file/81706533556.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/foxulokasomiwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+aplikasi+camera+tembus+pandang+untuk+androidPDF link annotation
    • 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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 18056 bytes
SHA-256: 5569bcc7e9b26d38a008821556e3c3411eee20fcbc8d4f99e5aa3949b8e23729
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 11276 bytes
SHA-256: 8bfbc723ab63154a6d76e7f45271a7a66cc55cab0c85b2389af29e70a5d1b192
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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