Malicious PDF — malware analysis report

Static analysis result for SHA-256 d689a241030aee08…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 07:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7e2a8250d8e210b3a5e8febabc6bab4 SHA-1: dfc5459f74bd1bcd4b94d37e9fba0b0f3da531df SHA-256: d689a241030aee08edd79620e645392fbb9b8ba47aafbe6cef6329c0d31a94ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=aashiqui+2+full+movie+online PDF link annotation
    • http://rent2day.ca/ci2/userfiles/files/posekupuxizagasotakunexem.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/nuwugegesedanowowigu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/14570289265.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/temifofinatamimeg.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/fudarewovidogisuvivejake.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/1458859104.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/kisapixekifijadujeruxove.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kiziwetiwuwupowemodumu.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/60132226099.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/5539107137.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/31118397141.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/regug.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/69977055169.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/giwoseruvopuzadesuditoja.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/vewelitijanojoduni.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/79700672727.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/gajevis.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/39587982.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210921071718.pdfIn PDF document text
    • https://rotitelor.com/contents/files/19638196745.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/jasuxidaw.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/nonobamozokupiwuveb.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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 10692 bytes
SHA-256: ebd2b188271d3ebf46e85703b7c8c504ad39989d4215e5e2e80eb3802e71350c
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 17076 bytes
SHA-256: b35b03abad3d06a4d5bc2a1d204f6410c048cd827ade308f4e39d3620f282fd2

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