Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b67fc50ae4b4ce1…

MALICIOUS

PDF

77.1 KB Created: 2021-05-19 22:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 19e0cd0f29a2d8e886ec43b97a558ecf SHA-1: 24abe80d7248dd5b046c3c490250494c02573648 SHA-256: 1b67fc50ae4b4ce1fb77bc135ed321f47400fd094ae65e68fb6fbc2e5b8dc96a
96 Risk Score

Malware Insights

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

The PDF contains a link farm of external PDFs, with one primary URL pointing to a site offering a "universal termsrv.dll patch for Windows 7 64 bit download". This suggests a social engineering lure to trick users into downloading a malicious file. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://soxebez.ru/strik?utm_term=universal+termsrv.dll+patch+windows+7+64+bit+download PDF link annotation
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/2636255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423462/normal_5ffff6513ada0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_601f075881712.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/menex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_604fc95cea694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_60664daf62444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490725/normal_5ffb15648ef65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_606da41e3ffb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5fd0b86333c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_6068904020049.pdfIn PDF document text
    • https://luwusimoxoxaxa.weebly.com/uploads/1/3/1/4/131453453/9488107.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/d4af03c9-f75b-4d0b-9c18-465d9f1718e1/4249232403.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/how_many_road_signs_are_in_the_driving_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d78eaa-af48-425b-935e-439d7da3bc0e/wise_or_wisdom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fccd096-8c1e-4f13-8b7f-45210f8a4da4/45519996619.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/29306824311.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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 5952 bytes
SHA-256: 9447680da206d0193ef7511b21ec7d20b3dacfbc2f36bad1ec58db4d509ce870
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11280 bytes
SHA-256: 5d0f0b61efc27da001b10196cd6c1c66141c277f0efb42a68ec5edcdb2435e29

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