Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfea0fa12538630a…

MALICIOUS

PDF

74.9 KB Created: 2021-05-19 17:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b338053ca6c81f550f36d6d54faaba89 SHA-1: 3d51e32696207cd47b1b79db03ffea0967d6948a SHA-256: dfea0fa12538630a74520df4f41777d0a8673b7e97f451342bf043140a3629e0
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 0.9996

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://midufefew.ru/strik?utm_term=how+to+do+a+two+way+table+probability PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408593/normal_601c952eb9fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_5fe70d57b347d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_6003c299a038c.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/kusozujutusino.pdfIn PDF document text
    • https://fipowawebes.weebly.com/uploads/1/3/4/6/134601566/juduzojitu-tivos-xobezezovaniwe.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/9028080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fe53703cab11.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/daselex/bhoot_fm_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/jasaketetogesikoreturiko.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/how_to_connect_jbl_flip_to_iphone_11.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/18159902915.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/xerujasunawulenom.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/aerohive_ng_deployment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/formatting_worksheet_in_ms_excel_class_6.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/94686294195.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/hands-on_machine_learning_with_scikit-learn_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/son_of_dathomir_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/princeton_review_sat_classes_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/up_b._ed_scholarship_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/sokaposuvipolasabixodago.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/toronto_property_assessment_information.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/direct_speech_exercises_with_answers_printable.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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 5072 bytes
SHA-256: 3075447fb30f6ba7c9bd387283f842d8ef411ea8e886f343926b62936e768b9e
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10500 bytes
SHA-256: a21f65f75f1435f0a6830a5c33316f0b2a165b102c501d1231a6fb59335a67a8