Malicious PDF — malware analysis report

Static analysis result for SHA-256 1835a75056d72abd…

MALICIOUS

PDF

72.3 KB Created: 2020-12-09 23:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ef06099faf03d895cf0c183d39a975ac SHA-1: 9b2a0010943d715293e20d7f0b7cef26506b6410 SHA-256: 1835a75056d72abdf81406d20bb58206c0bb916d277bb4efc7102f8a9b523790
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious or SEO-manipulative content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the structure suggest an attempt to redirect users to external sites, possibly for further exploitation or to host malicious payloads.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafffi.ru/strik?utm_term=powered+anode+rod PDF link annotation
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/3959606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_5fd0ac78cdc09.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/b817c3.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/gowibujitax-kumuzesibuboxeb-wubewokenosimo.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uplIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b61a91b-7317-4796-bdfc-e87ad74c506c/51557892204.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3f5c3c02f22b9dd97494/1606303582015/kobawib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfe895e5c7695ca99606f9/t/5fc411eefa04221c719f264d/1606685167410/90516829687.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a453cd1e280355df5d9e/t/5fc69e39e6d49a06bb7be551/1606852153563/quinsta_quick_tools_for_instagram_growth.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51f2ebe9b693951262aaa/t/5fc747bfa907d7439cd7cefa/1606895551394/rummy_cubes_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bbab6f-6d0a-4d00-a4fb-ac40c6355a58/pro_beauty_tools_iridescent_curling_iron_reviews.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce57a5e68b41342bad78bd/t/5fd0ad94125f6a657a5277a8/1607511444536/bucher_magazin_aktuelle_ausgabe.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/detailed_lesson_plan_in_english_2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd08e2b4c4d833b8bf3d0f/1606224098394/20469207948.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 4704 bytes
SHA-256: 0a3f36f2b929d629f89360a63ecec62045bc53ba22692b7a7ea05213dc0f9d2e
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10704 bytes
SHA-256: 52e4ce63c21b2b7c4f6c2649cec147d3b40aaf6fbaafcb80fcfa1c02bfe27842

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