Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c829ab8a891705…

MALICIOUS

PDF

91.8 KB Created: 2021-03-10 04:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b77c56c84ad6094318cc60c0e08bfaec SHA-1: b46fe79a55a3692b0fa1fbdb397299c4e3291172 SHA-256: 40c829ab8a891705f6ea00e901a75acadcf21835b22d8ff329b042b5a505f32f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malware or visiting malicious sites. The document body, though heavily obfuscated, contains keywords related to educational materials, suggesting a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/award?keyword=maharashtra+board+12th+biology+textbook+pdf+download PDF link annotation
    • https://cdn.sqhk.co/lodikorep/lghiahf/hockey_app_is_offered_by.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/jeLQ42g/fubaraxi.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/17217479221.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/hiridWS/meligotuxobokotawapevujep.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/wufasar.pdfIn PDF document text
    • http://sibiwuketilivi.22web.org/when_can_you_get_your_drivers_permit_in_arkansas.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_35e9febe71544835bb8f39f60bb8fd0d.pdf?index=trueIn PDF document text
    • http://zimeketoxera.epizy.com/how_do_you_change_the_number_of_rings_on_a_panasonic_phone.pdfIn PDF document text
    • http://nozozuwovore.atwebpages.com/jezavumubalezibokud.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_efa31d20da064fb69056a62725d5164a.pdf?index=trueIn PDF document text
    • http://tunozesanapi.rf.gd/halliday_resnick_walker_solutions_10th_edition.pdfIn PDF document text
    • http://dikawuferiwa.rf.gd/rokifinoxuxanonugetopapup.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_46799e2982b245419f282bb3ba44c33f.pdf?index=trueIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_35802687a8ce409096ee20dd1a85d21c.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_6238e8c034454ef2b86a0c0f0d65b4cf.pdf?index=trueIn PDF document text
    • http://komiguzuvare.rf.gd/executive_summary_format_for_business_plan.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_f6add633c0114d048e3a391e371c90e8.pdf?index=trueIn PDF document text
    • http://luzozizibaf.rf.gd/varug.pdfIn PDF document text
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_48fc2b8af254470a825b606686372225.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_53ad5d0937b84f41a2921ee5a0767381.pdf?index=trueIn PDF document text
    • http://tenasupufowok.epizy.com/22959582554.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/74199448914.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 5748 bytes
SHA-256: 968fbafb01ea9d9d5aed88aef601ff890798665ee435a6cb45123059f2136efb
font_01_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 10168 bytes
SHA-256: ed6da9ac45f1ffed8345a7a67703d8a1913d2d9264523d9c6245e9d9d4847985
font_02_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_03_sfnt_off00013c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C30 11388 bytes
SHA-256: fcf0e0ef22fae6e8c9939de42bc45b7565880274edf2223962120906ab0e0c43