Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0fc92636e905ea…

MALICIOUS

PDF

80.7 KB Created: 2021-04-02 20:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: acfa0ecad4633d27f198b0338253b7c7 SHA-1: 832c5a7088f23cd00d060ff534421017e14c6d22 SHA-256: 5d0fc92636e905eafd72c450151ac7fdeaf4a0fa736a50283084ef3e15189a3a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on 'baarspo.ru', suggesting a phishing or malware distribution attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title suggesting a lure for 'employee self evaluation sample answers'. No scripts were extracted, but the presence of multiple external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=employee+self+evaluation+sample+answers+pdf PDF link annotation
    • http://reweder.site/28725674968x7nj0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_6008fd01acdae.pdfIn PDF document text
    • http://dixagodal.iblogger.org/biogeography_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_6059e3f7b5ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5ff27256ef2c3.pdfIn PDF document text
    • http://juilopkiretlo.ru/how_many_calories_are_in_a_grande_nonfat_latteu2nhl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_604860e61f39f.pdfIn PDF document text
    • http://pevokepavaxe.iblogger.org/63997534790.pdfIn PDF document text
    • http://nelezoroga.22web.org/1312988629.pdfIn PDF document text
    • http://duzakimur.iblogger.org/does_tracfone_have_a_smart_flip_phone.pdfIn PDF document text
    • http://daddytestit.xyz/best_tarot_decks_for_love_readingst6lpe.pdfIn PDF document text
    • http://brumbum3.xyz/kanawha_county_schools_wv_pay_scale6t3s8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/420d270e-e121-4344-bed5-46deffc8ee4f/56051521720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57569937-8bd1-494e-863c-16a0734bac5e/white_fang_1991_trailer.pdfIn PDF document text
    • http://vexodefi.rf.gd/rode_videomic_iphone_xr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde31124-16ab-411a-a86c-b7038b5b6f8f/92321554193.pdfIn PDF document text
    • http://vivizegijarugip.epizy.com/sikutumebimujurokazuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e7dd02-d86a-4321-a75b-6eb27df7cb43/mini_dv_camcorder_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e1b15e-a9de-43fb-93ca-3a6b5d2b7c67/printable_sentence_building_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36115e07-37a7-4696-a424-e34c578a6487/how_to_manage_couple_conflict.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008356a8-7806-40e6-958e-41d072fa5bc4/99434719261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63450ff0-a776-47d8-a3e6-f0aadb5ba2ae/31050086736.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_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 5396 bytes
SHA-256: ba2f60fe5444b027240951036204568823694e382f239754b0554a9bf08b554d
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 10652 bytes
SHA-256: 062c5c1d5254737103ea83ab56be0aaae472c2a3c7d687597fbfd17d0857325c

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