Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45899ca47e7eb00…

MALICIOUS

PDF

66.5 KB Created: 2021-03-28 09:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8e44bf1a9dfdcd02c26d73d81f0f3b17 SHA-1: dd222d573f61df50fe15de6ac6854a82d2a03f19 SHA-256: a45899ca47e7eb00bb24f0706c8daee3d39091e3a97e3f918b8e6b494acd0ee4
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains text related to audio songs, likely a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/123?utm_term=loafer+audio+songs+ing+telugu+lo PDF link annotation
    • https://cdn.sqhk.co/mojobugoge/ebgghdr/plague_doctor_mask_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/X8gjutY/givizibegowidokozabojazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_602f2b6369de8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497688/normal_5fff198bb54c6.pdfIn PDF document text
    • http://tilosag.mypressonline.com/zitebuguvatefotixonudopow.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/5152488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fe8b3ef51f0c.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/3561682.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/fulabigidunilopubiri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_343314d36b0747a49d5358c6c3a93486.pdf?index=trueIn PDF document text
    • http://pekamidakoj.atwebpages.com/acfe_fraud_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f9e200-616c-4b0e-8bbf-63c867843c21/nordictrack_c800_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73b4e48-be75-4357-9f24-7f9fbfdbb437/87049866572.pdfIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_bc6b472372644e71abe93dc44941a9d6.pdf?index=trueIn PDF document text
    • http://japinoxizidunub.myartsonline.com/tosofiwotunaturinu.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_2893ae0567694a29a567f21ee3177c8f.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_98cbf50789e6459f9144619f8fbc9496.pdf?index=trueIn 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_off0000c7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 5016 bytes
SHA-256: 278a620d38224d697cf152840be636fcdc15b0625ca0271ab236a8bf5a187216
font_01_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 10492 bytes
SHA-256: 2007a4dc511b1a3bdaed1c6fb3d4955439a39302db84cfa85fa85ffbad01c5e0

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