Malicious PDF — malware analysis report

Static analysis result for SHA-256 70377f5db7a88e2d…

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 18:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c87cc8efa00e349a69646bf829047849 SHA-1: 1d1fe6a3dba041ba1d98ab3cc1470970f7df6b5a SHA-256: 70377f5db7a88e2d03a94785831c0588131a5b02e27bf675bb5da0fe51ef3133
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature, likely exploiting PDF vulnerabilities to execute code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://ponafet.ru/strik?utm_term=charter+code+s0900 PDF link annotation
    • https://dunexagog.weebly.com/uploads/1/3/5/3/135303431/1182767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_6068e1865486e.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/gcjhUgh/76340302858.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/1676986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405443/normal_5ff28a1c286d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5fe9aa849b696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_60341c375da97.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/ieKgfgg/ketofize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_60148a4acf717.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/6646761.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/bf4e3340b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_603de9bf1fef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499656/normal_602488263eb89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fd0863c74d83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3423f25f-0562-4940-8324-9dc69d6d8456/kuvik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961c5588-91be-494a-a1c3-e6665df0da92/gifezuxexitoguma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7ab003-87fc-4ee3-9076-3564c61f3a5b/how_big_is_30_cm_in_feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d99bbfc-6b64-4344-b403-0a7c935a2372/28879797082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af0665d-d830-42b2-9296-0ace7174bc35/how_do_you_open_a_sentry_safe_with_a_combination_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56142b77-1980-478c-a4b7-cdf7a80be52f/51445719107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be4dada-1a82-4683-a24e-d90d46ad8183/what_disorder_causes_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8782b2-4538-4b42-9054-87b1382b4f89/who_built_the_moon_shinyribs.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 5196 bytes
SHA-256: aa274d74c2ef3daa9b05a71cbfb974964cfb6e88480465d3592b2a9691970929
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 10128 bytes
SHA-256: ea79e29309fb0fb831bd525ee397bc49e9ff84bb71adfbd8b828bf0d5b8cd1b0

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