Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9f3517961ca5b7…

MALICIOUS

PDF

83.7 KB Created: 2021-03-12 10:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c61cd04116c1815afe1b67f4f57048c8 SHA-1: 9648efff9fb3c321ca2a0b14be2eee9bc24c3fc8 SHA-256: 9c9f3517961ca5b7cdf95fb4c88a7b01a0752e50ca71e949ec755526fe6ee87c
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 0.9997

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://leonvi.ru/strik?utm_term=does+algebra+2+have+an+eoc+in+florida PDF link annotation
    • http://mizusowe.66ghz.com/2015_chevy_malibu_repair_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_a034853f41a3441da460a1e9b4c015e7.pdf?index=trueIn PDF document text
    • http://budunasetixap.epizy.com/i_m_going_up_yonder_sheet_music.pdfIn PDF document text
    • http://xogimutidum.epizy.com/how_to_use_a_mophie_powerstation_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/zekasogomoxolovanakasef.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_ff3a22a8f6934c05af5d6920a4107d5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lonozote/drawing_standard_bs_8888.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/30606789446.pdfIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_a355be50994843518b9868ab60c1c31e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/html_video_player_button.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/a6_envelope_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/how_much_does_the_nordictrack_1750_bass_weigh.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/siemens_cros_hearing_aid_reviews.pdfIn PDF document text
    • http://rabazefobozaxa.epizy.com/wordly_wise_book_6_lesson_9e_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/rukinobu.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/bhartiya_vivah_sansthecha_itihas.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/2467336864.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/english_dictionary_telugu_meaning.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_4ff1adf066e7484f82e41583210caa51.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_26226675dea84767899c21ca1f554ce3.pdf?index=trueIn 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_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 5616 bytes
SHA-256: 101dcf7c29367982d83e811393cfe173f5a63e66a4a3869a210e9bcaf55ca10d
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10592 bytes
SHA-256: 67734363f5ffacc023de4318572b05e313163f578fa5099414e2c17cd2fe28a0

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