Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8557888c459486…

MALICIOUS

PDF

74.7 KB Created: 2020-12-14 21:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7256605279c6befcdabe315d0f3537d9 SHA-1: 375128747f4ecfd23b6952592a60709c62bdd8bb SHA-256: 8b8557888c4594863c7b4cf565ff9afdcb16804ef67f8f1f00c6f877494b5ccf
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

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://traffset.ru/strik?utm_term=costa+verde+towers+maintenance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5f8f13e6033e1.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/9dec9fe8e39dee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fc9beac9a7ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5fa5476a8fce0.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/wenobagupexekap/expresssos_michigan_schedule_appointment.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0a08eaf37e3b6462e30c/1606289931732/position_velocity_acceleration_calculus_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7915fc2869f0c81c3f745/t/5fc809f350c7b33622e94aac/1606945268737/14317526651.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe092e08845d0924515771/1606289712240/plow_disc_cooker_canada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d70b12facd59ceceee7a/t/5fd06833cb6bfe602c4fcd64/1607493683896/1886505209.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5982e085bf90c0e1d0cdd/t/5fcdeee0920f47545bb75594/1607331552946/que_es_una_virosis_y_ejemplos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59aeaea4a794d566534d6/t/5fd16767071bbc68801d2c3b/1607559016951/suwagamotapamepozopu.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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 2968 bytes
SHA-256: 1c91280eb79ffdc858b6ecd2b9b1b9121e398c569f5702dd47e27479ee3b0056
font_01_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 5108 bytes
SHA-256: 1065e0191ac65ea43f96660228e838e08568e9100ed7311a647a5c0eee75faa1
font_02_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 10888 bytes
SHA-256: 6a03704e0ee372dcb354e6f262b371e79665d3dc39ac31b7be33520263d9bfc2

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