Malicious PDF — malware analysis report

Static analysis result for SHA-256 09601c55f26e4f26…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 19:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a0d6f0b51a5a9fd1fe9a65a793c9682 SHA-1: 6cc64ec1e2bdabbacb447c17c4552203c4ed5326 SHA-256: 09601c55f26e4f26a0377678d7d6b9af2c40484b05176670ef6d4003e0350369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect 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://irlanc.ru/uplcv?utm_term=learning+sequences+in+music+pdf PDF link annotation
    • http://farmaciafoglia.eu/userfiles/files/tefulepajuwi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135826c79277---soturud.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/pamakewejimezufekusotax.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/66292040501.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/remewememepetiraba.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/bejotosibeganokofusizekop.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/32683567944.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/42126535415.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/80247563681.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/92639468669.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/1887588384.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/82621185956.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210903195408611707.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/daxepibesabus.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/ludegukof.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf55024e0---88364612738.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/73700990049.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/simigexad.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/faruwejer.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/10499373550.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/dovilumumutal.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/wedipivilelaborajibi.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/teduvolozide.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/31527977136.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/50035218381.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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 14540 bytes
SHA-256: f5f6509cc84a48f8f67048ffe2fbd6ce8398b43d98ea8376fe9ac5d8386f1960
font_02_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 10900 bytes
SHA-256: b519d2565d82799952f70191338fea1121267a2aaf636b25d62919e5fd412f5d