Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88b6d6d99ddb541…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 13:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 675888ebea37beb225f4c42b02b76b36 SHA-1: 8019933db26746475e41e98b794c0cffdb86ea50 SHA-256: a88b6d6d99ddb541814178c1bf58a7505e5b3e4f2e5e129f179b9cb3d03ce41c
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 0.9980

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://ketchas.ru/uplcv?utm_term=botw+guide+pdf PDF link annotation
    • https://speak82.com/_UploadFile/Images/file/pawefuwomusi.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/sotevopufutevewojuwes.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139950e2ea40---zitotuf.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pisatirovesuzonami.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210904060950.pdfIn PDF document text
    • https://superpart.com/files/vewapegit.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/wadokekunowusagubeluxetur.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/zadivef.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/83377109022.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/memotupuzedaweruso.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lajakifewavifasep.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/85316862593.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sibufemomeniw.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/67868707064.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vasalibep.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161336be4cfe0f---47126739753.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/75841534806.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/3601236782.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/jawolawatonu.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/5820429364.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/60785012600.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/33353441363.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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 17948 bytes
SHA-256: 84cb6c01c89a298f874e775d00856b02841a065cd7913f42b5cf2a064be34ff7
font_01_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 10332 bytes
SHA-256: f03ff4f1939da48b637e176bdbc77df56412d0b23d3a3462c0195ae9a3b588ad

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