Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df40cbac5506871…

MALICIOUS

PDF

78.7 KB Created: 2021-03-16 10:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1b719717ff8dfa348d15561717d0a34e SHA-1: 03a46255172cf7723a8d2c18d3cdb459d93e21f8 SHA-256: 8df40cbac55068716b3108caa73239d2306b7b2348ff3b1aaa9f5b676a060548
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, including suspicious domains like pelibifir.ru and cdn.sqhk.co. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/wix?keyword=ions+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/dozirerom/D6vDhdr/23219482030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382789/normal_5fff5f7015c63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fce861b2082d.pdfIn PDF document text
    • https://punokoguset.weebly.com/uploads/1/3/5/3/135351172/xudenorumevado_zivofakumixew_wodorejomunage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_603f8bd4bc60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_60450099f28c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_5fe8f360e5e9c.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/gghezOQ/78075382150.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/0fe65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_600abd532832a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_603b9db8c2330.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/oifibhb/holy_city_of_islam_5.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/gCLifha/jidetuwukivivojib.pdfIn PDF document text
    • http://busevabafumoje.iblogger.org/muvanefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_604807f630dd4.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/pgjaufE/oceanhorn_apk_data_full_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budakofis.epizy.com/technical_report_writing_example_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa6ef0d-e220-4246-b0b1-a8e60601f7c5/lochinvar_gas_boiler_prices.pdfIn PDF document text
    • http://kobukapun.epizy.com/78548139827.pdfIn PDF document text
    • http://tekufokejogarik.rf.gd/15043843595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ed8612-2a00-4562-b894-5230bf3d9ad7/padofukaruzanomajujap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f3e18c-0396-45af-8a73-304829f7e6dc/47786523639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4443dc9-13fe-435d-b344-7a28a86fc4ca/72321332859.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_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 4980 bytes
SHA-256: 1cbc0ece05102ea4acb38af22f519b0efd48c7177ca43f6855ce0d046e179814
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 10204 bytes
SHA-256: 579db47b6168debe7fe7901cae480b2993333bd5b1ac9f0e81d03daec8071581

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