Malicious PDF — malware analysis report

Static analysis result for SHA-256 9455bddbc07e5b44…

MALICIOUS

PDF

79.6 KB Created: 2021-05-27 14:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 92a292e784639a6445d46c772ccbd703 SHA-1: 6a258c191bb5d2b68508cd87cd5405d80bf5e0a1 SHA-256: 9455bddbc07e5b4475c24385fd1eea632eee5aa7d4a68932ada3781fccd1424e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to distribute malicious content or phish users. The presence of a malicious ML classifier flag and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=will+schools+reopen+in+2021+in+illinois PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5ffaba3a42e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_601fd56107907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_60034f336236c.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/4822766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5ff1b2082787d.pdfIn PDF document text
    • https://puxamosawakexa.weebly.com/uploads/1/3/1/3/131381243/linasaso_xozumekisiwufe_gikokiriler_lowosopaje.pdfIn PDF document text
    • https://loboweron.weebly.com/uploads/1/3/2/6/132681880/4426966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_6033444ab7035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_603c2f408dd34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407807/normal_5fdd4a367db50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_601b3ff644820.pdfIn PDF document text
    • https://tulipigalid.weebly.com/uploads/1/3/4/3/134392473/6248908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba3b022-1882-4f6b-82bb-1eb61b1639d8/how_to_use_munchkin_time_saver_bottle_warmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60d2f8f-256f-4763-a1c4-a1b26f8ed175/54701828291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2838f30d-5491-4e03-8526-7502d6b5fe4d/71024342400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7aca64-631e-4274-bfed-3b8338cd795d/marked_a_house_of_night_novel_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2392129f-0f91-44b1-8ad4-fda80570ec33/how_to_replace_fan_hp_probook_4530s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc84dc87-599b-4b3b-bad6-8fc7989d89f3/why_is_netgear_so_slow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfae8a8f-5d01-41ed-9d3f-c8053e36f3e3/79278139297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e16214f-21ff-4c2c-98b0-9e08755522a0/forty_rules_of_love_sparknotes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 5148 bytes
SHA-256: aeed15c42d24edaac2f31660a76303acbe8a27f7adac48c600e42280e892ad68
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 12544 bytes
SHA-256: 8446568c56e8b580167e6b995e4bc285d00b133d3667edc5049d3038f57fd961

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