Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f38cfd0bd14972b…

MALICIOUS

PDF

43.1 KB Created: 2020-06-02 00:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90f9ec4519a8ec7d442260114016d4f1 SHA-1: 92ee7cd7ea11f2e2bc6d2168f5f450ea086e0289 SHA-256: 6f38cfd0bd14972bd1f1f16e55a6ba3d21135d0aebd5618cfbf7bfa48bc43da6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains a large number of external links, many of which are structured as SEO-optimized links pointing to other PDFs. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'basic English pronunciation PDF'. This suggests a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness.

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://suntidetravels.xsideas.com/uploads/1/3/0/2/130288924/130288924.html#ingles+basico+pronunciacion+pdf
    • http://jaomarketing.com/uploads/1/3/0/7/130740378/727a4ef004f7767.pdf
    • http://mattdanielmusic.org/uploads/1/3/0/4/130490875/3214457.pdf
    • http://webmail.manuelastef.com/uploads/1/3/0/3/130323603/boxopuzutuj.pdf
    • http://remote.thewoodsumc.org/uploads/1/3/0/2/130291593/bufimisob.pdf
    • http://tinypaperdragon.com/uploads/1/3/1/3/131398278/dca05214.pdf
    • http://suntidetravels.xsideas.com/uploads/1/3/0/2/130288924/terms.html
    • http://suntidetravels.xsideas.com/uploads/1/3/0/2/130288924/dmca.html
    • http://suntidetravels.xsideas.com/uploads/1/3/0/2/130288924/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xubakokupowi.files.wordpress.com/2020/05/terit.pdf
    • https://porugisi.files.wordpress.com/2020/05/wakoduvadeniganuwore.pdf
    • https://tekifevozeba.files.wordpress.com/2020/05/49902547232.pdf
    • https://zikoraxelu.files.wordpress.com/2020/06/68691555104.pdf
    • https://kozujatuvi.files.wordpress.com/2020/06/96618530531.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c5.bin
af353366455b89275e802c09aa0bade17d11b86ce4dc1beb8e88c0f75d959b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C5 12724 bytes
font_01_sfnt_off000089c0.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C0 16312 bytes

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