Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fb298b07a001b7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 21:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4047664e50b7e653b68fb1ce190e49b6 SHA-1: eaf825e30ab39cc8e010683e984ba0f6e0ab32d3 SHA-256: f5fb298b07a001b7f6918436b74a223f4e44e32558b39be7f3f0eacd608e6e0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of these external links and the overall detection indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=where+can+i+find+developer+options+on+my+phone PDF link annotation
    • http://americasbestwingspa.iorderfoods.com/uploads/files/49355598947.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090412290848.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2045e8bfdd97270e0c684170c42fb09b/592033766.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/kerajizutijulivaluremi.pdfIn PDF document text
    • https://rubfila.in/files/file/54948143065.pdfIn PDF document text
    • http://chromavials.com/d/files/69614790037.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/48868007389.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/12511942960.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad290195a---30174445767.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/fabukotopatena.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905221223_6x6sym.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/xutapuforuju.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/020c2538e8b5cd2c1786b7b1fdc7a40f/70329620438.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/wubib.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/zafug.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/walivonitiduvusorazu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/zojijafebujafebazaliwe.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/49286852566.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufatewuvokapitiniz.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_off0000bf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9D 11060 bytes
SHA-256: dd511a08553584dfecbdf4cd584a2c3762203d35033c7b9775e0e44b72474bea
font_01_sfnt_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16476 bytes
SHA-256: bb737d19b207632e5c9f5c86448045c7a2f8b9aafd020125943187d9d1676e3d

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