Malicious PDF — malware analysis report

Static analysis result for SHA-256 f796f392305f5b3a…

MALICIOUS

PDF

70.2 KB Created: 2021-03-23 09:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c2dd82e3b449be3cb6ef229825bef3 SHA-1: 34e9706e1f96bea7e4b6df09636be8b4f039b96d SHA-256: f796f392305f5b3a3e1173f9c3f96b8e3144eaa6ccd2cf5c6f5e46440579463d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate search results. The primary malicious URL identified is https://soxebez.ru/wix?keyword=american+sniper+livro+pdf, which likely serves as a lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=american+sniper+livro+pdf
    • https://static.s123-cdn-static.com/uploads/4408321/normal_5febc57b2bdbe.pdf
    • http://questotzvezd.space/of_mice_and_men_reading_guide_answerm19l7.pdf
    • https://static.s123-cdn-static.com/uploads/4483842/normal_5fe2462d15a42.pdf
    • http://caterm.ru/kozotisirusideraniry1od0.pdf
    • https://cdn-cms.f-static.net/uploads/4451353/normal_602273afe4559.pdf
    • http://bosemefawixuwov.mypressonline.com/92918128033.pdf
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fccbbe80da95.pdf
    • https://cdn-cms.f-static.net/uploads/4500897/normal_6056397e6e3fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_16090c681b6e48d9bd2fb353ffb12332.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_f88bab2e4411472a8634799e32d27089.pdf?index=true
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_317b707186d9447ea58a4e8fc241575d.pdf?index=true
    • http://pabewuvuxaf.onlinewebshop.net/fusejedenenuzumedewukinav.pdf
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_bb4f00a2bdab4348b67b164e45f8aded.pdf?index=true
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_7ccf202232434a2583111cab0baca184.pdf?index=true
    • 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_off0000cf93.bin
56a90c2f662722b2c9cbd81008589eb90599c6676c5f9dee2dedf5a653c33525
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 5352 bytes
font_01_sfnt_off0000e1b5.bin
20575ed3edbf700c46089b12a7b798ba8846ccc632fcef05a6757b5e70ccb1d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 13600 bytes