Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8ea668f17c2f9d…

MALICIOUS

PDF

80.2 KB Created: 2021-03-13 22:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 617b1a42d656c7379908da72a3120908 SHA-1: 8f2cedf1f4262dc29042f3d0dec4a638a6ac0b1c SHA-256: 6d8ea668f17c2f9dfa6d10f67e058c8946c3fab1531be58293859cd0aff3ffe1
186 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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/award?keyword=adobe+pdf+editor+app PDF link annotation
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/5f05d.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/mogipepasiregujegigakere.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/paperusexup.pdfIn PDF document text
    • https://vorajazelilax.weebly.com/uploads/1/3/1/4/131407498/gewumividabojibax.pdfIn PDF document text
    • https://mogivara.weebly.com/uploads/1/3/2/7/132712472/c7d977b6b4f.pdfIn PDF document text
    • http://paxebuli.iblogger.org/ipad_annotation_app.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/xevazidesarelazunik.pdfIn PDF document text
    • http://barefegek.iblogger.org/examples_of_conflict_resolution_strategies_in_nursing.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/falcon_4_bms_free_download.pdfIn PDF document text
    • http://nibitekafo.22web.org/big_green_egg_grill_cover.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/11448412896.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/pafiwunogax.pdfIn PDF document text
    • https://joxukitemubat.weebly.com/uploads/1/3/5/9/135957717/64d6ca132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodegifu.atwebpages.com/how_many_calories_a_day_on_dash_diet.pdfIn PDF document text
    • http://nowapuporab.epizy.com/definition_of_internal_control_over_financial_reporting.pdfIn PDF document text
    • http://vupoxutefefa.rf.gd/interesting_facts_about_human_brain.pdfIn PDF document text
    • http://gawebunopom.rf.gd/sifewomerurasebibar.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/pelerumefuzis.pdfIn PDF document text
    • http://padavitapep.epizy.com/56465504686.pdfIn PDF document text
    • http://wupaxozejite.rf.gd/mexaxosu.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/performance_appraisal_employee_comments_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/wosasosesise.pdfIn PDF document text
    • http://xesidif.epizy.com/alphabet_exercise_worksheet.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_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 4956 bytes
SHA-256: f51e4499427af4bfd9ab51f3c86d258180640584f4a27933a8e2a4c677f47c9b
font_01_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 10516 bytes
SHA-256: e844c1a92149fa533ec89c2306a9ef1d8e14b91fe181eca3b8e1d9cc77f82c2d

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