Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66a0d89277a99f1…

MALICIOUS

PDF

76.5 KB Created: 2021-04-05 10:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba82e79b9773efca24624d198d417ce4 SHA-1: 2ec4ddf6b25e15b18707b869115b02d31770261b SHA-256: f66a0d89277a99f1512d3fb40cac876cc478e7c60da3de81afe60287c728aaa2
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and potentially malicious redirection. The 'PDF_SEO_LINK_FARM' heuristic indicates a high volume of outbound links, with one pointing to 'difipalilif.scienceontheweb.net'. The presence of an embedded URL and the ML classifier's high confidence score further support malicious intent. The document body, though heavily obfuscated, contains references to 'Hp photosmart plus b209a wireless setup', suggesting a lure to disguise the malicious nature of the links.

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://seumenha.ru/strik?utm_term=hp+photosmart+plus+b209a+wireless+setup
    • http://difipalilif.scienceontheweb.net/convert_file_to_word_doc_on_mac.pdf
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6012bf71f3bc8.pdf
    • https://cdn-cms.f-static.net/uploads/4482882/normal_60469253806f2.pdf
    • https://cdn.sqhk.co/wezufunin/Dtih1ji/kuvabe.pdf
    • https://cdn.sqhk.co/wojusipi/dvjblgd/94900894753.pdf
    • https://cdn-cms.f-static.net/uploads/4403687/normal_6023b8d5ab1c0.pdf
    • http://xemizawufogutuf.scienceontheweb.net/97854860019.pdf
    • http://rusewigojubilon.mygamesonline.org/sense_and_sensibility_movie_watch_for_free.pdf
    • https://cdn-cms.f-static.net/uploads/4493545/normal_602b9c7cf26a8.pdf
    • https://cdn.sqhk.co/gubujurit/ehgcYxo/27745617429.pdf
    • https://cdn.sqhk.co/tuxogafu/h4hjdgi/88318008825.pdf
    • https://cdn-cms.f-static.net/uploads/4366664/normal_605100f03c65e.pdf
    • https://cdn.sqhk.co/moxibusas/WqhaQ7r/24638374887.pdf
    • https://cdn-cms.f-static.net/uploads/4481994/normal_605673a8bdec1.pdf
    • https://cdn.sqhk.co/dezorevukor/FEnQieR/vaxusurokenejogef.pdf
    • https://cdn.sqhk.co/tifobebe/RMqT3ic/mevazuzakatakutomo.pdf
    • https://cdn-cms.f-static.net/uploads/4460972/normal_603c2310a12e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_e887c5cc36b3482393eecbf3bfe80c1c.pdf?index=true
    • http://dufobirufo.atwebpages.com/sonaxumasaluf.pdf
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_51cbd1b54c19493baae01dbbe85866a5.pdf?index=true
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_8befe132bfe04fc9b76800f5346afd67.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_off0000e8a9.bin
d6c7c8ccdf0be71f4898c699fb2d402f89641cd17d55dea80ce4eb7de8ff3cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5684 bytes
font_01_sfnt_off0000fbd5.bin
e637e7a1a35aed84df72486e5eb5dc50b46f7c39ccf366537ecc4216b696ed53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 11408 bytes

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