Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbcfc16f91c9fb4…

MALICIOUS

PDF

83.0 KB Created: 2021-03-30 18:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c377efb72c589797c643c4eff50f28be SHA-1: c9edf4e49c042bdd671186f229f74313a023471f SHA-256: bcbcfc16f91c9fb46a321f66d7c2fc73005063b7d0d8a8e1bed05099ff39e0c6
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to potentially malicious sites or for SEO manipulation. The document body is heavily obfuscated and contains metadata from wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/09d54f95d.pdf In PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/jiRjcub/92017289874.pdfIn PDF document text
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/3435111.pdfIn PDF document text
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/fodoxawewenowuku.pdfIn PDF document text
    • http://afracheat3.xyz/ativador_windows_7_ultimate_64_bitse5xt9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419451/normal_5fe0447f88e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446776/normal_60523ec4cbe93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_60542ff6ae5ec.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/dgiejeV/33018131184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492901/normal_603020993c834.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/how_to_know_if_your_starbucks_card_is_registeredxlts6.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/66gehfD/8814396309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_600a1b50ec495.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=how%20to%20identify%20strengths%20and%20weaknesses%20of%20a%20qualitative%20research%20studyPDF link annotation
    • http://nivodonugito.rf.gd/17506381634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffafc78-e02e-4027-a3d3-dd775d1bc37d/verbs_form_list_with_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087cada5-75a9-4566-9acb-c5784d231471/fexoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00192dc5-3fca-4c4d-9d78-a1e4ba272637/icici_best_mutual_fund_for_sip_2020.pdfIn PDF document text
    • http://logiratawune.rf.gd/titus_andronicus_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0639fb9c-ec39-4f66-bcc5-3edafb550165/why_is_risk_assessment_important_in_health_and_social_care.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_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 5568 bytes
SHA-256: aa29b95b0291a352df753efe11a6c97e2c47f8a711beb2f5f01be71d461ef6ab
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 12024 bytes
SHA-256: 94ba2b688844f82129eb390e00c490fc301c66dd9c15444534218a773a50cf9b
font_02_sfnt_off00012fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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