Malicious PDF — malware analysis report

Static analysis result for SHA-256 d750c5d068d86d32…

MALICIOUS

PDF

67.8 KB Created: 2021-03-24 15:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 950e469410bbb666f6ce72cf0114b122 SHA-1: e0545890cccb9f63668abb518a82f8d5bf95ddb2 SHA-256: d750c5d068d86d328ef641255b16ede32b51f821bb21a509f70ab0efe0411038
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The primary URL, 'https://jottigo.ru/123?utm_term=upkar+publication+book', suggests a lure related to publications or books. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely for distributing further payloads or phishing.

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://jottigo.ru/123?utm_term=upkar+publication+book
    • https://static.s123-cdn-static.com/uploads/4484815/normal_5fc5eecc378ac.pdf
    • https://cdn-cms.f-static.net/uploads/4456379/normal_603eb0dfbdd49.pdf
    • http://sunny-web.ru/bsc_computer_science_books_free_downloadmzvio.pdf
    • https://cdn-cms.f-static.net/uploads/4412154/normal_6049d207f282d.pdf
    • https://cdn-cms.f-static.net/uploads/4403807/normal_6014bd18e2259.pdf
    • http://healthit.space/a_pinch_of_salt_poem_answersacnqb.pdf
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd150aab243f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ba3e7971-4ac3-42b9-91d4-7b45a47d899e/what_law_explain_the_slope_of_an_isoquant_line.pdf
    • https://s3.amazonaws.com/setigafat/74187571479.pdf
    • https://s3.amazonaws.com/numegubowalonan/lonely_together_english_song.pdf
    • https://uploads.strikinglycdn.com/files/3be9d192-2711-46c8-b85b-3b3dea8aed25/62143388702.pdf
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_49b7e0e30eea467dbfa580b2bc388c8a.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_0e4927baa94c4897923e9adf797cb564.pdf?index=true
    • https://s3.amazonaws.com/gurafoga/coordinating_conjunctions_in_spanish_worksheet.pdf
    • https://s3.amazonaws.com/bufexa/javascript_date_now_format.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_6f6ef8251a084bfe9f29bbca8fbfebbe.pdf?index=true
    • https://s3.amazonaws.com/xefezesebusu/vupijiritogirukaw.pdf
    • https://s3.amazonaws.com/rizezobabub/revopufogavo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd6c.bin
4545508ab66ffa8d110ec9b2fe07145f388c4568a3061f95cd0c09e3533d4b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 4944 bytes
font_01_sfnt_off0000de50.bin
15e1b15cf2768c9dfac04d579e85cdcd454878601e8fdcf81da8057a45a33049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10396 bytes

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