Malicious PDF — malware analysis report

Static analysis result for SHA-256 4253864225dec36c…

MALICIOUS

PDF

68.7 KB Created: 2021-02-21 16:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a8c5d2137e0fc95267dad209fa4337b SHA-1: e0eb290b0e45f22fc24d8c86f920fbf4ce6e666f SHA-256: 4253864225dec36c5eb4a0442364e5944a414820c570c38e09bc49a35387e699
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of URLs like 'https://baarspo.ru/123?utm_term=focusrite+scarlett+2i2+3rd+gen+setup+mac' and 'https://s3.amazonaws.com/buxoparadazegu/plague_inc_cracked_full_apk.pdf' indicates a potential lure for users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=focusrite+scarlett+2i2+3rd+gen+setup+mac
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/7628547.pdf
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/4358756.pdf
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fc71debb105e.pdf
    • http://hookup153.fun/sibiwufibutotuzakijebegardpio2.pdf
    • http://bnatural.space/13574812268ztviy.pdf
    • https://static.s123-cdn-static.com/uploads/4462681/normal_5fec00421e120.pdf
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5feb29083627c.pdf
    • http://icub.tech/jubanumiwurobatuduwejaraizw40.pdf
    • https://static.s123-cdn-static.com/uploads/4477408/normal_5ffba0d057728.pdf
    • https://static.s123-cdn-static.com/uploads/4377114/normal_6007b471de601.pdf
    • http://persequenteamsohbet.com/95640582086nlhhy.pdf
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fe9b97af3824.pdf
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/fukavazopazarep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buxoparadazegu/plague_inc_cracked_full_apk.pdf
    • https://s3.amazonaws.com/juvetaso/business_informatics_subjects.pdf
    • https://s3.amazonaws.com/dojivewobasuval/vpn_free_uptodown.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a8.bin
f92ba4f5c7946acbf9f3fbf60dc04df53fd0619a39b916822802410009ee5402
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 5644 bytes
font_01_sfnt_off0000dcc9.bin
3079917e6212263ac94e3bf5384b678a0fb9b872c2c98b27e04eb221b9237496
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 12648 bytes