Malicious PDF — malware analysis report

Static analysis result for SHA-256 706f16e0e17247bb…

MALICIOUS

PDF

77.6 KB Created: 2021-03-07 14:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4fdb9844a238b5137d2b9ac4c4be2c51 SHA-1: aff1fe2a0912f70ddcf8a2042135e3b62f7242b0 SHA-256: 706f16e0e17247bbd0854f781dca101fa0b14e1b582b63bb29f2d471cac92b6d
66 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a compromised or malicious site. No scripts were extracted from this sample, but the overall structure and URL usage are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/aws?utm_term=how+to+steam+tamales+in+a+rice+cooker PDF link annotation
    • https://cdn.sqhk.co/dijexovesaf/a0Dicgd/68889124656.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/25242922516.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/BUMfrjb/how_to_speak_real_english_app_download.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/timijokitigoja.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/aghidih/zulubup.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/80703601372.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/el_conde_de_montecristo_pelicula_completa_en_espaol_latino_mega.pdfIn PDF document text
    • http://jitiben.iblogger.org/visabidowebevo.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/Rwhclje/34003756246.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/how_to_set_sharp_atomic_clock_time_zone.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/lixolururixojaj.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/80276179463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somujewod.rf.gd/briggs_and_stratton_190cc_lawn_mower_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d496e0-ff2b-4468-9f7e-be0e1cc20e47/16055847108.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/46575702974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503e1c7e-464d-4a60-a7c3-a57ac4b1fd75/92442221962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2091ff21-0509-49c1-a540-a8b4d2f93375/27422259511.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/zimupavewa.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/69834267875.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/fe_reference_handbook_10.0.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/simpson_power_washer_leaking.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 5064 bytes
SHA-256: 4ac36a900d95cc52628501f4e21be7ca95336ee97113df485a6459ccd74c2dc6
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10732 bytes
SHA-256: e2cc2862894425b3a3f701553959e308947164c707111dfc33051d796a51330c

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