Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fe035217892e59…

MALICIOUS

PDF

77.2 KB Created: 2021-03-21 23:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31cc073800e4823e492263fa78ce9ca3 SHA-1: 6f91c83f05da59fa78fb8e18799c6f61b85b1b2d SHA-256: f3fe035217892e597748f2f8f77c71f7eb0de7b9cf51c75d4e6ef471f4f3df81
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. The presence of a large number of external links, including one to zajinet.ru, suggests a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=tipos+de+relojes+analogos+y+digitales
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6056fa8f6aa6c.pdf
    • http://mazers.fun/bijot0snvj.pdf
    • https://static.s123-cdn-static.com/uploads/4369936/normal_5fca3c0b21963.pdf
    • http://kekajavulaj.iblogger.org/20361841131.pdf
    • http://extraterrestrials.space/60846160324bk12s.pdf
    • http://rcasino.info/pejirubitozolovavabolb8gbc.pdf
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5ffa22b7dc2c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_d93657d9f2cd4e4b9d695ab1499d463b.pdf?index=true
    • http://vetuxularowuma.rf.gd/22028548185.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_b024b1dff9f746f79c4fa8d531f096b7.pdf?index=true
    • https://s3.amazonaws.com/musoxifuvitalo/solve_for_y_slope_intercept_form_worksheet.pdf
    • https://s3.amazonaws.com/sugosubexez/tenejixewapuxufe.pdf
    • https://s3.amazonaws.com/zalomi/14930994746.pdf
    • https://s3.amazonaws.com/degagaziv/83151451321.pdf
    • http://sukidagijonola.rf.gd/syndrome_dysenterique_choleriforme.pdf
    • https://s3.amazonaws.com/betefowubevat/18701432373.pdf
    • https://s3.amazonaws.com/kigavanus/64551487328.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/feboponitawax.pdf
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_8c5a64fbc6b540ac8ca069ba3e40addb.pdf?index=true
    • http://zekovulelopur.epizy.com/fairy_meadows_trip_report.pdf
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_8c56ac5558164c3e8540678fc62592bd.pdf?index=true
    • http://foxozokibi.rf.gd/kewoduxiwijakuvemul.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_off0000ed87.bin
032ecd5aac452bece527f573453724319212d99a30efc5badbc10b5794704201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 5252 bytes
font_01_sfnt_off0000ff7b.bin
85080843539b670a80843038f724036810e41878b15c35e97a6c775740d093d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 11884 bytes

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