Malicious PDF — malware analysis report

Static analysis result for SHA-256 0634634529299bb0…

MALICIOUS

PDF

78.7 KB Created: 2021-04-10 06:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6a4f05942f2f75fefa9422f01dd4365c SHA-1: db882d7b242e6b0430fc596b4a1370fe5ad2744c SHA-256: 0634634529299bb02cf06e1c62114d522aa0a98391ded9432bc07e05c626080a
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains a large number of external links, masquerading as search results, which is a common tactic for SEO link farms and phishing lures. The 'SE_PAYMENT_REDIRECT_LURE' and 'SE_CLICKFIX' heuristics indicate that the document is designed to trick users into performing actions that could lead to financial fraud or executing commands. No scripts were extracted, but the embedded URLs and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://kuzutuzo.ru/strik?utm_term=how+much+does+a+14+year+old+make+at+mcdonald%2527s PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fd68bf9b944f.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/OkjfZBD/tajupokavidimilinuteforo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_6029e023a283f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_604fa74de6d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_604364d29b1b4.pdfIn PDF document text
    • https://cdn.sqhk.co/vepanoxubere/jagdidL/sugarloaf_mountain_weather_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_5ffc8e972a2b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493867/normal_5fcd0bca3d068.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/youtube_hockey_fights_2020gifxj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_601885302f106.pdfIn PDF document text
    • http://supermagazforsale1.xyz/38935155705xvkai.pdfIn PDF document text
    • http://idealica-tufficiale.website/55538448452xizap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5ff9afb726d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_60437b46edd91.pdfIn PDF document text
    • http://mixit.info/my_name_ringtone_with_music_pagalworld3i82z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sowabufiki.rf.gd/gupuzofuj.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_362d23b6cfb0422ba732447a0257f8da.pdf?index=trueIn PDF document text
    • http://kunasajijujaf.rf.gd/89744472886.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_82ec4d22bd88483c85c10702e6a6580f.pdf?index=trueIn PDF document text
    • http://wiferowifi.rf.gd/xagakezopezekug.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_984c473c24ce4c2b92b14b724c538d43.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 5572 bytes
SHA-256: 8fb886eb8431b9e23f5b35052dd7ab627860595bbfe057595064150ca14dc6fe
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11000 bytes
SHA-256: abaa8b4f040425ce2d6af76147d8ca8c8b0542a4f4b459cd6b2f6d1a1c15cc29