Malicious PDF — malware analysis report

Static analysis result for SHA-256 e439bdac4b9ed950…

MALICIOUS

PDF

69.4 KB Created: 2021-04-08 23:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc82f6690c641cf4ad7dba33a5c03fe3 SHA-1: 22cfd384b9749c04b2e825131e0378c807210693 SHA-256: e439bdac4b9ed9501bfc6f9a8a6b9598bff7c629b65a2e34a5caed8b02a74e0e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru/strik' which is likely the malicious destination. The document body, though heavily obfuscated, suggests a lure related to a 'Drug information handbook 2017 pdf 2018'. The presence of embedded URLs and the overall structure are consistent with a phishing attack delivered via attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=drug+information+handbook+2017+pdf+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418379/normal_5fcf68cc30307.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/78837402221.pdfIn PDF document text
    • http://instasurprise.online/position_of_the_day_playbook_onlineckm7l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ffe295412c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd63916cea14.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/tapudugavuzujozazegos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fe62e26b44e3.pdfIn PDF document text
    • http://kismykeitio.best/2971130335rte6g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_60625353a899a.pdfIn PDF document text
    • http://bt-management.website/caresource_medicaid_ohio_appeal_form64xw6.pdfIn PDF document text
    • http://smartradiobf.ru/77807864771z47t4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_e70049f436a64a90bcd0e260c937a24e.pdf?index=trueIn PDF document text
    • http://xogijowag.onlinewebshop.net/95513293879.pdfIn PDF document text
    • http://gavofime.atwebpages.com/action_research_in_kannada.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_3fbedfc4d3d043d4a26eb654a9d13061.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_b22edede65eb4cc0a62f59f933aa1f59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupuxus/corrugated_roof_sheet_lengths.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/pikatipupelutixetipedo.pdfIn PDF document text
    • http://futebowa.atwebpages.com/brownian_motion_and_stochastic_calculus_karatzas.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/hp_laserjet_p2055dn_manual.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_78766b56317e455c98ffbc40944a01ba.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_3fba9b2139404cf0923d499bacf0ebc3.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/what_penny_stock_to_buy_now.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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 6048 bytes
SHA-256: cc8e40f689b8a7c391fd095d042663d43b7369d83c7be53d01df7e2e97af0488
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 10056 bytes
SHA-256: 970385b111cd189b95d1ef4cf78cf112c94f2497e49c5b81c6cc3f2dafcf9ac2

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