Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc695f243be77738…

MALICIOUS

PDF

78.8 KB Created: 2021-04-02 21:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5607b0d7f5297e008a60934b6f9c40cb SHA-1: d9d240f75afee8b0c7024f70c9ae4ebfefac23fb SHA-256: bc695f243be77738820ddb00faf22dc4fd6a205c0ef208c292273a90d0b4ed1e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=types+of+distributed+operating+system+ppt PDF link annotation
    • http://jaxagogilexet.sportsontheweb.net/introvert_extrovert_ambivert_quiz.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/bleeding_time_duke_method.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/regutavelaw.pdfIn PDF document text
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/febunuvul_ponaninatano_xapopobu_zorurozejaji.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/bible_in_kannada.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/84009826306.pdfIn PDF document text
    • https://refitefajo.weebly.com/uploads/1/3/2/6/132683069/runajawidenep-kezakemotero-kawikekufep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rebomedug/10164323916.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/51154162124.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/eragon_book_chapter_summaries.pdfIn PDF document text
    • http://lojawesepex.rf.gd/4473788454.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/fawasadikunekujoguwefo.pdfIn PDF document text
    • http://govatari.rf.gd/vadirerep.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/cedulas_de_auditoria.pdfIn PDF document text
    • http://sanubexudo.rf.gd/45057562001.pdfIn PDF document text
    • http://misebupafavo.rf.gd/wezifukedakugifoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/camera360_selfie_photo_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/spanish_dictionary_poder_conjugation.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/votekusa.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/27201450521.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/my_grandmothers_house_lesson_plan.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/tratamiento_de_residuos_organicos.pdfIn PDF document text
    • http://tusibav.epizy.com/94561709401.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 5520 bytes
SHA-256: f1ed3363cdae8efcff613a59c2e6e85bb5f87028a0f7e86dcaf9cc0adac60a80
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 10368 bytes
SHA-256: 1b313d9411e2b4768820a5ca459a457bfe3b8ba622a388671f53846522c34701

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