Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a886f6e0aee4b5…

MALICIOUS

PDF

83.1 KB Created: 2021-03-27 12:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b86a6d2c34ddff9c5582b4d4cf6c0851 SHA-1: 62e02d930ae1aa39762b404495a8fba112711484 SHA-256: 91a886f6e0aee4b504970f9beb9b3c85beb5fbde56fb633261fa4cb5e88ff723
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'anatomy colouring book for nurses', likely intended to trick users into visiting the malicious URL. No scripts were extracted, but the presence of the external URI and the ML detection strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=anatomy+colouring+book+for+nurses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501501/normal_600dbc4fd0239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_604fd6fb555ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_6005753f17722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5ff33cf9e1754.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/astaxantina_propiedades.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/adobe_photoshop_cs6_tools_and_their_functions.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/koweroviri.pdfIn PDF document text
    • http://xagevogewa.medianewsonline.com/38596562225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_603c5493d0c38.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
    • https://s3.amazonaws.com/luborinizu/line_6_spider_v_60_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ac2a6f-ad0a-42c5-be43-b4d6144a3324/fuxisamo.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/nedodetakobedixuduwumi.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/wivujumotikew.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/fukeweriguko.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/48584036554.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/potapezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9016c0-a902-4923-bba1-5a8ed479e5cb/smoothie_recipes_with_yogurt_and_protein_powder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4cb221-8cde-4642-89c8-1a8f80eca1c8/53246162969.pdfIn PDF document text
    • http://farudigenudoze.onlinewebshop.net/70496996773.pdfIn PDF document text
    • http://vegubom.atwebpages.com/appositive_worksheet_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fefc646-8458-449f-94cb-5f676ecc3ed7/math_mean_median_mode_range_definitions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bb3de6-89a2-4305-928f-635caf1d7586/multiplayer_games_to_play_with_friends_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/what_causes_a_honeywell_thermostat_to_go_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/statutory_compliance_certificate_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 5380 bytes
SHA-256: 6db7b01f5eacc1cc26c6b3f365cdc538519d65445bccc3218479a18f34193ef1
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 11240 bytes
SHA-256: d019b5b6805bdd086eccb163014a73d91fbae80e3b3d626bf5b98b2c88e51b26
font_02_sfnt_off00012f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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