Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca838b0e7546b60…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 21:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d7b3e21c6c54248da6b9c436c7ac1630 SHA-1: 96094b37f9d6f8d0b61ce108d3d64cf85ee7acbc SHA-256: dca838b0e7546b602d52039495498448cebecda41cb19f2ff50bc0c935329280
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to suspicious PDF files on disposable or unknown domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://steinemann-ag.ru/wopifatixekipunemixefew.pdf In PDF document text
    • https://heritran.vn/uploads/news_file/47908944488.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131829294f68---vomipesedupetulukidej.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/90460662707.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/lexigugigejezixawixemotod.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210911094723.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/maxepusejirafezifobejemev.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/sajerab.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/66562607232.pdfIn PDF document text
    • https://cooperspick.com/files/kodirigudevatig.pdfIn PDF document text
    • https://cmoretv.com/userfiles/kajujisefotanezewajitabo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/59567762205.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/3767295988.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55357722560.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/63287676395.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/69746477334.pdfIn PDF document text
    • http://goldmustang.com/files/files/leveleresawoj.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/puvezuvexowux.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xavovixalarero.pdfIn PDF document text
    • http://finchamauto.com/pics/loneruliw.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/92233170509.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/69421298727.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lililokeroga.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///gipiladinoleti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aradhana+theatre+today+moviePDF link annotation
    • 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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 17076 bytes
SHA-256: 168ee8244e04a5b1416112125c2624e5c5ef86a4fce18c6d2ce5d5210b0bc20a
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 10460 bytes
SHA-256: e24a398efb366755c6e58faea49b00994cb9ac4a35cc3365b6f65dbe978a35df
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1