Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5bf39ab405ea9e…

MALICIOUS

PDF

77.0 KB Created: 2021-05-12 12:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ff69c94fb27e8758ed86c4cf3539fd13 SHA-1: 86b794c7bf0b6a8bd34e8ff970134d1914a982d8 SHA-256: ce5bf39ab405ea9e990f836d78f2388bfd0211a0fbbee29be3c1d0e0b3305422
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik`. The document body, though heavily obfuscated, includes search terms like 'Ford mustang mach 1 price uk', suggesting a lure to attract clicks. The presence of multiple links on disposable hosting and the ML classifier's high confidence score indicate a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=ford+mustang+mach+1+price+uk In PDF document text
    • http://just-gopro.com/40028389484fpfd6.pdfIn PDF document text
    • http://famexukox.22web.org/factors_affecting_bacteria_growth.pdfIn PDF document text
    • http://newyearshop.site/84340822732zessy.pdfIn PDF document text
    • http://vandify.com/28790944827sb8ib.pdfIn PDF document text
    • http://chatik85939775.fun/riptide_gp_renegade_switch674v9.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/siwokawitututirapir.pdfIn PDF document text
    • http://getfreecreditreport.info/what_is_the_difference_between_milwaukee_m12_batteriesdbu99.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/kekiloribidozobugovadap.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/afb610bc-090e-4d6a-b705-35bce1ce2a57/jaripalejoxatat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c9a24c-526b-4763-a026-8c8f1a7c393d/84658638051.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/addition_and_subtraction_to_20_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a587670-80e0-4cc5-a4bc-541720bf0680/homelite_gas_blower_vac_review.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/76144374484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978e2c0d-7258-44d1-b5d2-36062b0af93d/what_are_the_new_navy_prt_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85dcbbd-a171-464a-9f2a-46f591e6bdef/43498767691.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/is_it_safe_to_put_mattress_in_pack_n_play.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/25668814817.pdfIn PDF document text
    • http://girifatu.rf.gd/ssr_125_pit_bike_parts_diagram.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/lamomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fddff58-e0a3-47ae-b525-22364efef9f7/sazojonakedanemabom.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/firinazapo.pdfIn PDF document text
    • http://mewexam.epizy.com/zavor.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_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 5524 bytes
SHA-256: 72a9613a8ebbd939621bd01d7c1be32091fefcc9a1408efc193435f0037bf607
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10476 bytes
SHA-256: 005adc3354ac43b5dea825a2b6ff12eb8ea21c8d03f48b46ddadd564a916e3f0

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