Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0988dbe72899488…

MALICIOUS

PDF

101.9 KB Created: 2021-04-08 13:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8966c6c078fe75228c73a16f64579fad SHA-1: b866bc24339b4a6eb48507786d701e50ff2ffe69 SHA-256: c0988dbe72899488ed1cea9d69c44e2387b9a8e72cfe7d0d7c0af9a204569a28
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and references the lure text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=ffxiv+commercial+survival+manual+iii PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505358/normal_5fd8367cef9ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474456/normal_60015ca8e67b8.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/stumbling_on_happiness_review.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_6059bcf845d60.pdfIn PDF document text
    • http://tuvoreda.scienceontheweb.net/grutter_v_bollinger.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najijojovigom.myartsonline.com/imperative_and_exclamatory_sentences_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/avisynth_mt_x64.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/48894132660.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/classical_conditioning_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/zubasujekanujegozadof.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/what_level_reading_is_junie_b_jones_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/food_stamp_guidelines_indiana_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/sum_of_exterior_angles_of_a_regular_polygon.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/54387954572.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/a_few_lessons_for_investors_and_managers_by_peter_bevelin.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/apostasy_report_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/march_of_empires_guide.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_off00013862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 6932 bytes
SHA-256: 636363130da8d5ba5d4e99cd854c2b193887df54ee59e64fe11285fd4330eec2
font_01_sfnt_off0001500e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500E 5108 bytes
SHA-256: 049724256167dd06d4456cb15e332ca6d5e9dff96c8c89c11075e3c03d515d28
font_02_sfnt_off00016163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16163 12396 bytes
SHA-256: d1e8feb97ccf60b05dc8ac1ca300df6e8f0abcd429abd81b80d3a33168fb735e

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