Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa88adc696a7bb35…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 08:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 783d68d83506fdeedf10f41d506530a8 SHA-1: f7cbbcb68b123dc3c7018951390bae8359293917 SHA-256: fa88adc696a7bb35b3a83fcf7c5eeaf356e802f19f27700ab58b5d9e77c1362d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=best+video+editor+apk+without+watermark PDF link annotation
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/vafumosediwedibo.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/muzimejabejuvikoxu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac660d4a04---vuvoxab.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/kudugijixekarufuxeza.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bca17d9187a0984b570e18f7fd9048d/63718210476.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/kowedopupefuzefefekat.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/74669748956.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/guvidisakewibekoret.pdfIn PDF document text
    • http://enricobarraco.com/files/mekuluvesasabo.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/jebinixu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dujafelibuxexugodalove.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/pudizo.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/rigegi.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/82457286357.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bajiwupewipusi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/56305281257.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/vizulijoz.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/37399677217.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/11493653817.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/75263689462.pdfIn PDF document text
    • http://vkts.se/userfiles/file/gavabojimorafa.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dunolapodunasiwusosasip.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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 17424 bytes
SHA-256: 4df691d4671c2706810009bb6762e3a399b16b3be17d873a3791b4693020464d
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10904 bytes
SHA-256: b4fe85d5cc30dd6594f9916d112db2b7fb07b9ef657ed947cfae83c79ec06e21
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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