Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b86f5047a11c34…

MALICIOUS

PDF

85.8 KB Created: 2021-03-28 14:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0187b68a86152bb3cca491a585812b50 SHA-1: 2da4007c60bc728bdfd80677646bd1ada60ea2fb SHA-256: 79b86f5047a11c34f22ee797ae8b1015aab1abaf572e9ba364b9bb48f0b7126e
66 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded URLs, many pointing to disposable domains, and utilizes 'utm_term' parameters, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards a potential phishing or malicious redirection scheme. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=how+does+sucrose+concentration+affect+yeast+fermentation PDF link annotation
    • https://cdn.sqhk.co/bubarozotuj/9hjgRvY/lubomotob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5fd8076fdf6e5.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/bizizuguzipa.pdfIn PDF document text
    • http://balifruit.com/zewegepineloxatasisj7hu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fcc736971f26.pdfIn PDF document text
    • http://varistop.site/godunewensyey.pdfIn PDF document text
    • http://goromeo.club/bofodapovoxagipona07z.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/6484632.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/wZwPgh1/bingo_cards_games_online.pdfIn PDF document text
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/vubudexoduke.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/dxymvjb/dijomoduwoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_6025b958c24cf.pdfIn PDF document text
    • https://lumamiwaba.weebly.com/uploads/1/3/4/7/134735329/bovemiv.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/jhcgfiM/kick_the_buddy_apk_android_4._4._4.pdfIn PDF document text
    • http://revershjtb.site/64040085705no32u.pdfIn PDF document text
    • https://cdn.sqhk.co/rapenikidu/ifIVSgc/nososewawotomewoxu.pdfIn PDF document text
    • http://zdsshop.top/how_much_does_it_cost_to_get_scoliosis_surgeryllolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/farowug/how_to_make_my_keyboard_light_up_lenovo.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/nolamosuz.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/4025026384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4319038-91f3-4a0d-a0e8-8c260fabf6e9/87756485137.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/pewter_report_cover_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b424d03a-02c7-48df-a95a-7cffc4f534d4/geissele_aimpoint_pro_mount_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/nikowe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 5172 bytes
SHA-256: 629978c3af4000d83a560e0506d81eba4427e222f2ce7c9af5630f70a03a0a07
font_01_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 10936 bytes
SHA-256: 885b8dc245d10ae91fab2d090e3df11a8a765d9af3cc4d05c8c1f05509d229be
font_02_sfnt_off00013b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.