Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5b64a12c75f8cf…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 12:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 783a36e1648fff0cab1f48de01d2758d SHA-1: c0010be4155eb62d0c9614e640f0fbc1f806cf83 SHA-256: 1a5b64a12c75f8cf0da7140d9fdc567d5db5283c25b18a1c7deecaadc0b12428
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/wix?keyword=boomwhacker+play+along+musication PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466673/normal_5fe218f2c2bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_602b5971ab5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_5fd286907de87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_60098c32ef134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_60305c057d9f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_5fd36ee539338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_36523ce51fd04a8aa449d405981e03c5.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_0d5be0ba1cfb4be2a12647ce884a51d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa7933c-0fe1-4328-beca-af6b3b437e37/pubejudus.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_b8ebfb4be3544bf3a3a9b32488d021f0.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_266ec21111674711a3bab2584374c4b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8823e7-16fb-4ecf-8699-bbe5935341b5/lenovo_thinkpad_t430_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c1ad9a-45f2-41ca-97e6-50653b1796f1/professional_ethics_engineering_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed65f232-d44d-4a8b-b266-abc8c744d653/75307999102.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_8c805c17579b4dac9a8a70db9388e4c8.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_c6d610437b8a40fa8a9c657cbdb094a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c9b86a-ddc5-43d6-9d1c-d49841140194/46574305461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070bd6c9-92d8-4636-90ec-a24daac2021c/432747592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996ae807-4189-449c-904d-1695323a15c7/all_the_bright_places_cast_addison_rae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc48798-92e5-4cec-9b94-ffaf7050606a/30682874377.pdfIn PDF document text
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_77feac288d834aa8ac79e2f9463faea2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2061bd-e883-4e0a-be54-d8e475822a7f/what_do_you_feel_when_you_feel_love.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_c8f15b7ad15546779ebf7f8c30fdbd52.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_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 5656 bytes
SHA-256: aa6d6bbb0d3e7dd36998869443348762c554fef75eb6a9a176fd4fbfcf124f4a
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 10440 bytes
SHA-256: 3d37db7fa8584b1c1d93d26d02ee69472a0908c18b92a9325420aae71bb95240