Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d76822d73c9c488…

MALICIOUS

PDF

88.4 KB Created: 2021-09-21 16:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d48d270e2d730c5673f8418409e047df SHA-1: 0da27900a73f587a02b864f63f0ac5812ecffc76 SHA-256: 6d76822d73c9c488905f3d0526b8be6772912ce356affd07b248bab1ef2352af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=lootcase+full+movie+watch+online+free PDF link annotation
    • https://htapigroup3.com/contents/files/kozofofowekopazululiro.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/15563971630.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ba536c15---julapowoge.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210910195018.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/80169265946.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/89397283781.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210921010856.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/22208897762.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/90200981512.pdfIn PDF document text
    • https://superpart.com/files/66035009241.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/97551122313.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/76466428724.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/burugetujimebenovewo.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/fogevubezizuxewo.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/movofikitubefoboferap.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149185fc350f---66450568720.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/xuvekasolenimumupe.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/sanipozemu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/20161487334.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/vifag.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-12/20210912045730491431.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_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 17596 bytes
SHA-256: 2494289a1c62e98e643e4382dfd7410447c2166b870e44c8b3c75355ab8fb2db
font_02_sfnt_off00013b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 10808 bytes
SHA-256: 35cd766b5edef10b199c93478ef22ca402170f3545e9f37c1ec1503ba02c5ae7

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