Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8a362935f04f6e…

MALICIOUS

PDF

77.8 KB Created: 2021-05-25 05:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f8ab5418bef325de1dc93152b2b28ecd SHA-1: 2cd678ef29b243a217a6242a30402b06aae101b7 SHA-256: 8d8a362935f04f6ec7dca73aeef6a2c42b3e32d75a407e51a0500f8a7b423e89
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious sites.

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://pelibifir.ru/strik?utm_term=octet+rule+worksheet+for+students PDF link annotation
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/4883344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_60543a23694cd.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/pipuwikotipelonemit.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/bujopofarede.pdfIn PDF document text
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/sibafamefaf.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/2789245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6043866fdc175.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/mobuzak.pdfIn PDF document text
    • https://rujibuteza.weebly.com/uploads/1/3/5/3/135308743/wusemikobolal.pdfIn PDF document text
    • https://ladipepisosixas.weebly.com/uploads/1/3/4/8/134898905/laxunusidewawefo.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/efed056b-d3b0-4008-afec-4dafc71b0148/tinowevij.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/mailchimp_template_full_width.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/online_venn_diagram_generator_3_circles.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/63725800919.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/canadas_national_sporting_authority_resigned_from_the_fia.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/19097416733.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/32284551104.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/how_long_is_harry_potter_8_in_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/best_devotions_for_dating_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f27e91c-0508-414d-95c9-ee2ed2713555/does_wendys_have_50_nuggets_for_10.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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 5080 bytes
SHA-256: 6795a0afa5fdc58ef45bc83959a3418983eb1511c789322f5051d34ad9ac56f0
font_01_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 11324 bytes
SHA-256: ebceff702f51c8cc9f3f3f80712e41f420e119a9737d8c2fe35efdf41a588542

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