Malicious PDF — malware analysis report

Static analysis result for SHA-256 5556f40dc09ce654…

MALICIOUS

PDF

71.2 KB Created: 2021-06-05 19:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 773c99a63db8b7a11165bbe55ba80808 SHA-1: 06a50c46e726d301899c5f659df71eb4ceb37bb5 SHA-256: 5556f40dc09ce654257b58bf1ea5d587f0995889b558341187e28f6eabc7fb94
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, including one pointing to 'crewmak.ru' with a query related to divisibility by 3, suggesting a deceptive lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a phishing or scam objective. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://crewmak.ru/pbw?utm_term=what+are+divisible+by+3 PDF link annotation
    • https://verozofuxedu.weebly.com/uploads/1/3/4/3/134330920/dexupudibokef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_605f3613db583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377902/normal_60089648d9989.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/2429243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_605c47cccb577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_600e6e9aae104.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/1304771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_605add9e53222.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465024/normal_60b62e43bc6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_604fee77ea8ba.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/bokiputupipugov.pdfIn PDF document text
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/kobutozuk.pdfIn PDF document text
    • https://kimewazokedusa.weebly.com/uploads/1/3/1/4/131454536/kixiso.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/2c14c722-105e-4815-a897-b612e0a63300/allophones_and_phonemes_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9469735-0eb7-4e67-a67f-852711df61b1/28974849416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1870b1c8-e3e0-4d20-b56b-c4cfcdbee296/how_do_you_turn_on_a_microsoft_wireless_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e522556-acd8-4066-9f25-995141f5bada/digitech_rp80_guitar_pedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229cd211-22d0-4770-bc54-b2ea71a8586c/zopuvetovojago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feecd382-e073-4aef-9421-0552e8686fe4/brown_bear_brown_bear_activities_for_infants.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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 5392 bytes
SHA-256: 1037571a1ed9be00f586f57ba4b0668a208bc5d16475106052c457def39d87e2
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 10132 bytes
SHA-256: 953864097ba0eec1e641f4a453cb6bad1152d36262ec7c8b395e9a26b9d66304

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