Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f9a560207bc1eb…

MALICIOUS

PDF

81.2 KB Created: 2021-03-27 11:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b8f6e4073aa5e55af44548b1be4999a SHA-1: dbca6f24629314b40851861a90e2d78d8b5e380c SHA-256: 98f9a560207bc1eb98343f3b1011e8f3f1b95c35971e9886f4be37ee0c7e756a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external URIs points towards an attempt to redirect users to potentially malicious websites.

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://resalured.ru/strik?utm_term=is+the+movie+revenant+based+on+a+true+story
    • http://tophomework.space/hoover_linx_18v_cordless_stick_vacuum_cleaner_bh50010_reviewrtoq8.pdf
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/8918122.pdf
    • http://kexopikusubewul.22web.org/isometric_and_isotonic_contraction.pdf
    • http://easterthjg.com/515909308958ladi.pdf
    • https://wovitinukid.weebly.com/uploads/1/3/4/3/134372120/66558d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xupewosupegosax.epizy.com/zugaravowezupivadiz.pdf
    • http://wesovipimamino.epizy.com/6_month_probation_review_questions_and_answers.pdf
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_ce7f8e3ae99c4d07a861108d3bf43d77.pdf?index=true
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_f0048286f27443ad87a5c2b3de798f35.pdf?index=true
    • https://s3.amazonaws.com/jofunozuzof/45036423867.pdf
    • https://s3.amazonaws.com/kudowo/tigufozovoxixemitamet.pdf
    • https://s3.amazonaws.com/xozeb/juvojar.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_cc05cb1eb2774eec8f1f2516b3ebb805.pdf?index=true
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_9402cf65c4264bcaa06f36ce2a321a95.pdf?index=true
    • https://s3.amazonaws.com/megulu/53985648441.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_off0000fffc.bin
d3d8525775fee1a4ca93cf65a898e136563a800dcb5b1ed10facfd9c08bcc41c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 5272 bytes
font_01_sfnt_off000111c1.bin
43ad1629e11a5f84ea4b6126966a92f2bba7f5a4abf85b6bf150b6a2745e21b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 11000 bytes