Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93fdce9544bd8f2…

MALICIOUS

PDF

72.1 KB Created: 2021-03-16 03:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bba35d07cb279e6ca453f8d2addbb179 SHA-1: 5ee94d229af965ed290288ad050567fc533d6458 SHA-256: b93fdce9544bd8f28ceb27e27d5c596b9af06b43c123ffd57dc5c35e5222519a
126 Risk Score

Malware Insights

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

The file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one pointing to 'botokaw.ru', suggesting a lure to a malicious site. The PDF structure and embedded content are consistent with attempts to disguise malicious intent, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=binomial+distribution+problems+and+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd6624e3032d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492880/normal_5feb4a6edc898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_601a7de4cc432.pdfIn PDF document text
    • http://ericksandoval.com/sc-1000a-car_battery_charger_manualxmuhw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5ff3ca1eb86a4.pdfIn PDF document text
    • http://it50save.info/petrifilm_coliform_plates8pbd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_604ce2b82ce44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_ea7d8536d1f749cea162e2951eca0104.pdf?index=trueIn PDF document text
    • http://tekoboworitutew.epizy.com/klamath_river_steelhead_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/bhakti_songs_in_telugu.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_f24cf0cb9edc4940909a69f7641e3e1a.pdf?index=trueIn PDF document text
    • http://debagejusuwaj.epizy.com/bing_wallpaper_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/84224543790.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_3a38b7776ab14eb2a0265e416170c624.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/micron_analyst_day_2018.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_3b681692debe463d94da228ca0140e5a.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_b77c3475a5c641599f2c9d48b7380239.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_ef9e2fae0e324a0e952f9699c7be4baa.pdf?index=trueIn PDF document text
    • http://pavoserelolaw.epizy.com/wupilobajofizirom.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/minn_kota_riptide_i_pilot_manual.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 5376 bytes
SHA-256: 1b2c742810ecbda5570f8efb0897aaf3e214ba88b95924ba4bf8ed399421feb3
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 11100 bytes
SHA-256: 5bee0baf8d6ed1cae013e623f58c1f67089b1f2a515ecc805da13bd1c1595356

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