Malicious PDF — malware analysis report

Static analysis result for SHA-256 836dc6e457619d9a…

MALICIOUS

PDF

104.4 KB Created: 2021-03-18 21:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ab4bbcd353ab73a31c5fb99a1ae341f8 SHA-1: b606e3807a477eab52f6059b6a7a61534e17e5f6 SHA-256: 836dc6e457619d9a53729345aba3448582b7c1e375298426da11ea6c9a0352da
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that masquerades as a search result for educational material, likely to trick users into clicking it. ClamAV and ML classifiers flagged this PDF as malicious, indicating a phishing or trojan payload delivery attempt. No scripts were extracted, but the presence of external URIs suggests a potential download or redirection to a malicious site.

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=cstephenmurray+types+of+circuits+answers PDF link annotation
    • http://wersita.fun/61615693423q2hsm.pdfIn PDF document text
    • http://jibitivi.66ghz.com/42395218439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380871/normal_5fe4184ec534f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fddca524df7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5feb43123e783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_60040d31550e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_60285e06225d2.pdfIn PDF document text
    • http://cupe1.ru/a_study_of_tungs_acupuncture1t0c6.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://uploads.strikinglycdn.com/files/c7e55f0e-0f85-43da-8c6d-9d2929caddde/wokuz.pdfIn PDF document text
    • http://lotawovuvowuk.rf.gd/teaching_critical_thinking_creativity_problem_solving.pdfIn PDF document text
    • http://wowawese.rf.gd/u._s._marshals_1998.pdfIn PDF document text
    • http://votepawawirinu.rf.gd/zezikavedavatogewapoduson.pdfIn PDF document text
    • http://jamovame.epizy.com/busy_busy_neha_pandey_video_song.pdfIn PDF document text
    • http://museduzapotu.epizy.com/how_i_reinvented_myself_at_50.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64343ec7-f6d7-4d6b-9a61-a4cdfebb26fc/livewire_ts_6.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3431b7cc-cb15-418c-bff9-e2cae965ace2/vejowefoxepumose.pdfIn PDF document text
    • http://bakajejupuxa.epizy.com/duwagiwuzewurevavijafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06baf85-2c09-4dc4-aa50-c63261763072/hp_photosmart_d110_wireless_driver_download.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_off00014cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC0 5320 bytes
SHA-256: b4d656c35762dc25bdac95d742034eea6f8b5ff2818c568adac0082bfeb7ef38
font_01_sfnt_off00015ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC1 11520 bytes
SHA-256: a55ac351a54747f49bb615f6911936be093f86bdce8a974383fe79bb66498dcc
font_02_sfnt_off000185f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185F7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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