Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f19a36cac4edd4f…

MALICIOUS

PDF

41.4 KB Created: 2020-04-05 10:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7a391b8a1a58bf7af826e009421a2fa2 SHA-1: 29a736f9d562f3a4aa0617dd5943d1080e6a3aba SHA-256: 7f19a36cac4edd4fd3643e246b6c8c6ede9aa72978de43854272807f26ba7d5b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are structured as SEO-optimized links to other PDF documents. The document body, though partially corrupted, contains text related to a book summary and the authoring application, suggesting a lure to disguise the malicious intent. The presence of many external links and the ML classifier's high confidence indicate a high likelihood of malicious activity, possibly leading to further compromise or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 http://whatthejinx.com/uploads/1/3/1/3/131380109/131380109.html#trevor+noah+born+a+crime+summary+chapter+1
    • http://lorislibrary.org/uploads/1/3/1/0/131070246/puladenujo-tofaxanazuju-rejam.pdf
    • http://yumkc.com/uploads/1/3/0/3/130323641/xefopavuzodezig.pdf
    • http://justplanedetailing.com/uploads/1/3/0/6/130605229/getetaziwipodet-dulowo-dodaje.pdf
    • http://urastar.org/uploads/1/3/1/3/131380992/gemuxuma-belara-rasemegowa-tazezokugibaxuw.pdf
    • http://55a212942p24rb.com/uploads/1/3/0/7/130776659/c2da0282a.pdf
    • http://dunnprobusinesssolutionsinc.com/uploads/1/3/0/2/130292014/16532b616e38fc3.pdf
    • http://parashantiyoga.com/uploads/1/3/0/2/130288441/19067dadeb1bfb.pdf
    • http://illinoisglobalscholar.org/uploads/1/3/0/9/130969103/04d896.pdf
    • http://honda-accord08-for-sale-by-owner.com/uploads/1/3/0/6/130639877/junogarigomis_remimolivetexu.pdf
    • http://cdzw-heads.net/uploads/1/3/0/6/130604458/1528325.pdf
    • http://sparkleindiana.com/uploads/1/3/0/7/130775605/56be2d40.pdf
    • http://tiendanow.net/uploads/1/3/0/6/130620456/cd38ca72c7fb.pdf
    • http://summitcentrebarbados.com/uploads/1/3/0/7/130740046/352e35be.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b21.bin
a102eb77ddeb7e21161641c6c995a8d767941b36c1058508a3df20f38c2ac6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B21 7476 bytes

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