Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cbc8e5270c40c0…

MALICIOUS

PDF

112.5 KB Created: 2021-03-27 21:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cec02ca33de6eaa7b6f98e5f71d005ab SHA-1: e5108f9a4a7ccdd5246fce5eebdffb180c58ba97 SHA-256: 02cbc8e5270c40c057fc3796349762e81620884476c2784bcf4711af435768d6
184 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The embedded links, such as `https://yafferge.ru/123?utm_term=tv+guide+birmingham+al+bright+house`, are designed to redirect users to potentially harmful sites. The document's structure and embedded links suggest an attempt to exploit users through phishing or malicious redirection, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=tv+guide+birmingham+al+bright+house In PDF document text
    • https://cdn.sqhk.co/vakolitakap/9if4ghd/bts_dynamite_lyrics_teaser.pdfIn PDF document text
    • https://cdn.sqhk.co/zuboxizip/Yhigdhf/campaniform_sensilla_in_insect_legs.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/dt466_engine_oil_capacity.pdfIn PDF document text
    • http://renavakurexiroz.22web.org/fuzabejilebekugu.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/humana_medicaid_prior_authorization_form.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/3jeiijh/game_wallpaper_hd_for_smartphone.pdfIn PDF document text
    • http://gabixumupa.22web.org/smith_and_wesson_victory_owners_manual.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/jorge_luis_borges_biografia_y_obras_resumen.pdfIn PDF document text
    • http://vixerixobo.22web.org/sobaxolisasogoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_2ce2bec8358a4115954b520d88e0a20c.pdf?index=trueIn PDF document text
    • http://pinavobanokewix.epizy.com/88188018401.pdfIn PDF document text
    • http://pezamax.myartsonline.com/biografia_de_benito_mussolini.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_6baa6dd8283e474f86aa3d0fd7577597.pdf?index=trueIn PDF document text
    • http://wurebosuloxu.myartsonline.com/62466300365.pdfIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_fc2cf0743d5841409db6b0bee5826ab8.pdf?index=trueIn PDF document text
    • http://zafitubebetero.rf.gd/gakixikulowefukuxovoxijas.pdfIn PDF document text
    • http://jaluwapuleg.epizy.com/como_resetear_router_asus_rt-n66u.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_44beb21e7e804d38839fa5f608462e6e.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_36f7710b7f1e450885fe0a5c098b3ecf.pdf?index=trueIn PDF document text
    • http://jekurur.atwebpages.com/1131193912.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_off000177d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D1 5388 bytes
SHA-256: c83649530e10f3d9a3d3c69f44cee806b0fecfbb4847ccb2fa78e26eea837d12
font_01_sfnt_off000189f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F9 12232 bytes
SHA-256: 5a14fb5c1ebda1e65c6d5ab4f324247701f9164cb3f886b495d6714e113ad96d

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