Malicious PDF — malware analysis report

Static analysis result for SHA-256 3798dbff7f2d58c7…

MALICIOUS

PDF

66.1 KB Created: 2020-12-07 19:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a74a879f2434199be07f09e8999ce624 SHA-1: 6d49759d799bf78d17c725cdd8a248cc6bebc519 SHA-256: 3798dbff7f2d58c76524ab351277e29ec6690b9d3ec97b2b4b4684b07251e6a8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/strik?utm_term=choosing+the+right+word+unit+3+level+f PDF link annotation
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/16bc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f8877f2a4144.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/demapelib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd03c072f8b574a0f450b6/1606222785204/93725982952.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfe7e212facd59cea75dab/t/5fc81c74d32d012678ecebdf/1606950005145/huawei_health_website.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a84402915d4a16f9ca82/t/5fcacd117626e35e5d7d7a2e/1607126290895/17154853021.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e9036b97992eb55c1f46/t/5fc95c2d3ff5340c4d190b35/1607031853682/94965814215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0c2a65-76b9-4813-a6b5-b136b3c4c02d/mafubukotaxunimojamuwel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55d4d8ef7301f8b2ec065/t/5fc8bd1bd17d55300fb5112f/1606991134617/taptap_tap_apk_for_ios.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfb2312cf09257bd651d14/t/5fc18d782dd96f59182a0d8b/1606520186021/35307380871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2c9162-ece1-44e7-bdcf-ff5769fb1ff8/43912938509.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28fbed26ff1194f7e5808/t/5fc37ac5e6d49a06bbff368c/1606646470068/8350458387.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_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 5180 bytes
SHA-256: 11ac4cc5ddecdd2a0cb621be251b8449e9774b6069760b06933d57b2b86d283b
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 10524 bytes
SHA-256: 5a2d039049af04f0c13f255bb09220f8f82a4dabb35c2e5dc41bc1ed4f31fe7d

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