Malicious PDF — malware analysis report

Static analysis result for SHA-256 b836eb427f8107c3…

MALICIOUS

PDF

80.0 KB Created: 2021-02-17 15:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 25133a0c6d472cc8242dd83180a4ed53 SHA-1: 2bdd2dd562a7d7ff6c21fe9aed86b7fda3864d5d SHA-256: b836eb427f8107c3dbe86ec35c57fbf26dca7f5c74629a71388d3c62ca0ddc35
224 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector and uses a payment redirection lure, suggesting a phishing attempt. The embedded URL `https://yafferge.ru/wix?keyword=hay+day+hack+apk+ios` is a primary indicator of this malicious activity. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest an attempt to trick the user into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=hay+day+hack+apk+ios In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_6011aca57611d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc68e191573e.pdfIn PDF document text
    • http://prizinsta.info/42273276446w2ayr.pdfIn PDF document text
    • http://thesimplycompleteseries.com/como_jogar_monopolyz7nq8.pdfIn PDF document text
    • http://prizinsta365.online/pentair_minimax_nt_heater_repair_kit5acuc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_60234fe69f04a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fed9415a339e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fca5e65d3dbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_6026459830e24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369920/normal_60081bd2146a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454682/normal_5fcf2e634c921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_6027b8c0ce70d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_600b9e9625dfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogokumopukizu.epizy.com/ladasetijososobogo.pdfIn PDF document text
    • http://figaniver.epizy.com/jelizaputurogatotifevox.pdfIn PDF document text
    • http://milodip.epizy.com/possession_of_a_firearm_sentencing_guidelines.pdfIn PDF document text
    • http://bupuboteba.epizy.com/catalogue_ph_kin_hafele.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_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 5160 bytes
SHA-256: 5dc1384d9b51c1b8c3cc31b9a069307a29e07325cbc3ea8018df039802bc3b52
font_01_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 11148 bytes
SHA-256: 9edc604ccf394866c00bed9a57133b4c70f10ea352eb13a0e23d66c6ba6cf2b3

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