Malicious PDF — malware analysis report

Static analysis result for SHA-256 f936675b23dab771…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 13:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6f4ef776b9fe6f7cab838de17ab119cc SHA-1: 8e53de39af821bffbee635edd8343997e9f5b743 SHA-256: f936675b23dab7713e3e0106879e8e7d0905c06b62c7bcd4123bde32dc582c9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely using spearphishing as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=marshall+mg100hdfx+full+stack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fee3ae68ceb1.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/G96gdig/84466647670.pdfIn PDF document text
    • http://kulokozataxat.22web.org/jsa_template_wa.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/efZqPil/guide_for_picsart_photo_editor_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_6028c412e9569.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/YggD9fj/57640377887.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/guwotubogabalitoxomeza.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/clauses_and_phrases_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/jobaduwoludujeribu.pdfIn PDF document text
    • http://linanimeb.rf.gd/the_one_minute_manager_meets_the_monkey_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79054028-f243-498a-b7b4-4aceddd79d1b/how_much_is_a_sonic_mini_blast.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/rukakumimokipagifatenome.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_129991d9b81345f29b35c192c2948051.pdf?index=trueIn PDF document text
    • http://xelilurezo.epizy.com/17204786166.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/vehicle_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800a3cfc-b321-4231-8a46-121d969da860/46573842354.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_2e1ebdb3ab5c486dae0a4c5d6543ef5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/278342bc-913b-470b-87e7-8e1351e062db/what_a_2nd_grader_needs_to_know.pdfIn PDF document text
    • http://xoxitazowakovit.rf.gd/3348741210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac25b294-35dd-4afa-b854-2db3c4279668/libro_algebra_lineal_larson.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/51309905333.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f632917a24a74e0ebba25f04e9b195ad.pdf?index=trueIn 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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 5768 bytes
SHA-256: 927b331b7039383e8b74777c34c5d493735fd2d979954900ae27aefff5435bbd
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 11556 bytes
SHA-256: 2475f89aac1419d834705f7337ca309eef5abe2141a82d1c190a1145d019ceac

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