Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a4e865568c070f…

MALICIOUS

PDF

94.3 KB Created: 2021-04-04 19:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 597d17f5e1be335dc12ef4afce88c356 SHA-1: ec4feeb7bb30040e8d5f35fd5089b13a57be2f69 SHA-256: b9a4e865568c070f4db8119badfb9b3c08393251fcba54d0b5ecb1d4a6a92824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. The primary IOC is the initial URL which appears to be part of a keyword-based link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=foucault+was+ist+aufkl%25C3%25A4rung+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fe40159959a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392210/normal_6009957b2b6fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff89a04d8a9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_600cdf5fcea7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_605daf9c5be06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_60164ce0d7e74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_da5394953a7c4cf8942ce91d70e43d02.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_4985bda1b67948f9b2a09d3341fb4b3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb2cab9-03ed-439b-be50-313822338db9/sijifum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e787b029-e5fb-4e9b-8fdb-043c062c2376/76805880112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76bdf537-cc32-425b-910e-f3b07035a1ae/69391232253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629a8ee2-c612-49ab-9834-6ca637b1729f/jizaxujujotutufeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a088aa-0e50-42a3-a38b-87261cc10546/79674854217.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_75eb96ba24d54d31b69818bfc031f041.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e907d0-657a-4f7e-bdc2-8c622d4df4ad/epson_xp-600_not_recognizing_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c208cad-d623-412a-890a-7128a42b0ff2/rukapelakazudilejir.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_66183d3507b6422fa76e3bc68403b602.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e257fbbb-ea2c-4a3f-a188-bd17d8010f4e/86250704066.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 5436 bytes
SHA-256: f3fd9929bf462ac3dc972f8ef2b8530376a5c0bc1d2f00bbb17a172cbc8697ee
font_01_sfnt_off0001350d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350D 12096 bytes
SHA-256: be6b6ee5afb5eecc17f71e4bca3a1e77660b9e14213cadadb16bbd4397a6b9fc
font_02_sfnt_off00015c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C06 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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