Malicious PDF — malware analysis report

Static analysis result for SHA-256 052f57f20831bc39…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 17:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90dedfef2ac003d8517152a731a7547a SHA-1: d322f2ee54b26736ea899bac3fe2e1ce5758de51 SHA-256: 052f57f20831bc39e64a9e867628ffef8035ed0de6f0acd989331ea9ec006997
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a UTM term in one of the URLs suggest a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=pinball+arcade+apk+cracked PDF link annotation
    • http://darstin.com/userfiles/files/77891284509.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/526484667.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210910065619_ycln6j.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/24081891717.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/21772192598.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zadakatumunixajefawigafu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/4701686053.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/10544063354.pdfIn PDF document text
    • http://delve-cr.com/uploads/donizuwipesiselunem.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/vejevelumudodepigeferadi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2e68fcb3b88fd057b2f4040fe78b8585/72988746569.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/64883765393.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/26582818086.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/16411171201.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/69165426078.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/341313873.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/25231871863.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/11916518100.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/fugutokajuba.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/39007459743.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/65419372555.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/puvetasituvo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/51946584330.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lalolalesikerim.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_off0000b938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB938 10356 bytes
SHA-256: d7224d9f755083b3ee07352676dafc0ee46fc6e299342553ff6593eef89d8d99
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 16288 bytes
SHA-256: b1416fb1e1687b44671a7afbf92ba0257d08a4632561f9fa9da83954713303fd
font_02_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.