Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc7b8a7993fd35e…

MALICIOUS

PDF

70.3 KB Created: 2020-12-20 13:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c7a15b671062d897f5961af4ec802ba9 SHA-1: c10750b70211fb8f7c6e2ce4e642092d441c536d SHA-256: 8fc7b8a7993fd35e7518f3de86f8be09e173c362afa72e66dd0492f2fe2f7472
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The embedded URLs suggest a link farm or phishing attempt, aiming to direct users to potentially harmful external sites. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an attack pattern involving the exploitation of document viewers to redirect users.

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 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://trafficel.ru/123?utm_term=microwave+maruchan+ramen+noodles PDF link annotation
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/rojipela_gowefiguxabeju_sigukage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5fd64c87c6467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f968f566830d.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/fujilegemu_furebidedofev_nowavofi_xupidel.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://static1.squarespace.com/static/5fc4c2059698b02c7f395ada/t/5fc71538788a962b7c273faf/1606882616756/guilty_gear_xrd_rev_2_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc16b11c6229360ecb0a135/t/5fcae8d326a2be7f6dd9ba2e/1607133395705/horse_racing_manager_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/current_liabilities_balance_sheet_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d45850-d777-48cf-befe-a04e40e546b6/jolexofidunoxokamoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6a380d-02cf-453f-9bcd-5aa13b650d8c/61597854780.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/31815516643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db4e94c-5915-4d1b-86f7-6032a0abf31e/lesiluso.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf409c7afe470b5559c64/1606218762224/writing_about_art.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06a33fdc31513a1101c8/1606223523350/ggplot_pie_chart_alternatives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702da3bd-f2da-4fcb-bb98-467b31a334e3/75751278437.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_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 5140 bytes
SHA-256: ab446f2c0fa01cf2019e45e6a67f5f5565d56093cd8744df2f3ec1d8bc441aaa
font_01_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 11296 bytes
SHA-256: eea93abb4c085de8ed94c8289413fe5e31e9587d9e3630a13374ba5b0cb7f03b
font_02_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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