Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4636cea423409c8…

MALICIOUS

PDF

71.5 KB Created: 2021-04-02 15:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd9727b41c12c4541cf690fcf199487f SHA-1: 297b7cfc07e9af137aa9b15266d0064e449d5406 SHA-256: e4636cea423409c8ea241565babd9ce2fde48ea8c418dac747809be9f3df1914
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/wix?keyword=slope+and+similar+triangles+worksheet+pdf
    • http://pezozolagipiv.22web.org/32124930950.pdf
    • https://gonasegan.weebly.com/uploads/1/3/4/6/134640129/3368934.pdf
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/fakamajosiwejev.pdf
    • http://sesotilenavufe.iblogger.org/wukuxabemumu.pdf
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/6996782.pdf
    • http://pufivuziviv.mypressonline.com/applied_science_diploma_question_paper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zagebixomibolo.rf.gd/wopezigudojesatazu.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/alveolus_adjective_form.pdf
    • http://fipiwafupogo.epizy.com/fomukoronuxamano.pdf
    • http://xiwexuxe.atwebpages.com/fasanikujaburakadivafofob.pdf
    • http://rukaxeretipaj.epizy.com/how_to_clean_the_filter_on_a_dyson_big_ball_animal.pdf
    • https://s3.amazonaws.com/paxunu/carboline_carbozinc_859_data_sheet.pdf
    • http://zejajedep.rf.gd/tejeduboxafufikaxuve.pdf
    • http://sadakukozami.rf.gd/how_to_reset_kenmore_gas_stove.pdf
    • https://s3.amazonaws.com/zowibatev/angular_formarray_within_formgroup.pdf
    • https://s3.amazonaws.com/tazibabebamep/19028310789.pdf
    • https://s3.amazonaws.com/figugipopar/hisense_70-pint_2-speed_dehumidifier_with_built-in_pump_manual.pdf
    • http://durunorutap.epizy.com/92983843878.pdf
    • http://kodosalepixalan.epizy.com/61870075810.pdf
    • https://s3.amazonaws.com/vasofirida/best_browser_for_android_2._2._1.pdf
    • https://s3.amazonaws.com/dixaleko/24370167033.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_off0000d9c1.bin
68a2eb46c62d757d7976d0b353e73c0cfed479fc3a4845bf476b26565c4859bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 5716 bytes
font_01_sfnt_off0000ed1e.bin
25bf41dfd6687ec6ab9bb45400e09777eb98aa4a3d4d0cd090e31bdae32f0158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 10396 bytes

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