Malicious PDF — malware analysis report

Static analysis result for SHA-256 509b4cc096e99dae…

MALICIOUS

PDF

80.5 KB Created: 2021-04-05 09:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e126e2c20ebaecbb1479261dc69dd7 SHA-1: 20ee17bfd8f05b367a30e20d48d76fee2a131410 SHA-256: 509b4cc096e99daeb158adff844cea45639c23ed5735daf62ee9ebdf2e9b9800
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL 'https://nipisod.ru/wix?keyword=the+total+fishing+manual' suggests a phishing or social engineering lure, likely attempting to direct the user to a compromised website. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it may be a generated document used to mask malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=the+total+fishing+manual
    • https://cdn-cms.f-static.net/uploads/4464735/normal_6062bd709bb4b.pdf
    • http://libopadu.scienceontheweb.net/82678433912.pdf
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc8d7eb60873.pdf
    • http://vadememejunozax.iblogger.org/free_vector_art.pdf
    • https://cdn-cms.f-static.net/uploads/4527237/normal_60298d8c89e4b.pdf
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5ff4e7bdbb12a.pdf
    • http://fisuruwibowin.66ghz.com/american_pie_chords.pdf
    • https://cdn-cms.f-static.net/uploads/4370542/normal_602f719a7d7b5.pdf
    • http://ferafukapawap.scienceontheweb.net/alex_rider_serie_tv_trailer_italiano.pdf
    • http://warowusavi.mywebcommunity.org/64398952122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fikumowo.rf.gd/50165778939.pdf
    • https://s3.amazonaws.com/widiku/63924045925.pdf
    • https://uploads.strikinglycdn.com/files/7a071091-4278-42ea-bf0e-f5e1b84e415f/83699827489.pdf
    • https://s3.amazonaws.com/sezebepit/40808194258.pdf
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_4d674f7845db49b5805b0f77075ed331.pdf?index=true
    • http://sutazobizomobuz.rf.gd/lamab.pdf
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_48055b9f764847449dab5f5696b7d529.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e1c0020-acb4-4c6a-819d-a23a13e967fa/what_foods_are_best_for_brain_health.pdf
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_06cc78af9c9045309d0fe5d0e1dbf008.pdf?index=true
    • http://lamupimifuban.onlinewebshop.net/57104118997.pdf
    • https://uploads.strikinglycdn.com/files/28fbb640-8449-4b13-a7cf-358758461cec/dish_network_bill_phone_number.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf9.bin
5ef1f99e22f5c624b9d44deca59536e747934f927a050f77cbdeffbc737dee3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 5032 bytes
font_01_sfnt_off00010efa.bin
86fb8d62b4903da65d80cc259711af29527810472a6770d03334cd1ea210a200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 11072 bytes

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