Malicious PDF — malware analysis report

Static analysis result for SHA-256 597008a7e2d3eaa3…

MALICIOUS

PDF

78.4 KB Created: 2021-03-18 23:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 12d97985d281acfdcf1e7c8e84a12a60 SHA-1: 2abf908ac30dca67ba3bc367ab58386d1a645dad SHA-256: 597008a7e2d3eaa3aedb8e469971e994adb69a204d1aa1ef7fc1a83891b4c455
202 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. It uses an invoice-themed lure and an urgency-based lure. 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 0.9964

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=can+i+return+a+tv+without+a+receipt+at+walmart PDF link annotation
    • https://zosumomaxin.weebly.com/uploads/1/3/4/0/134040430/mukidinod_banekopafa_suzidupuzuleseg.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/8c93297607e412.pdfIn PDF document text
    • http://paloxebesigovo.iblogger.org/sitosimuvani.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/nekufodiv.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/vululedugebozapa.pdfIn PDF document text
    • http://jekebes.iblogger.org/josumafajiregonegiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_8313c38129f140b2a23f411dd7f3e041.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_c03285305be64d109d85bd585ac1b422.pdf?index=trueIn PDF document text
    • http://megutid.epizy.com/honda_x_blade_bike_image.pdfIn PDF document text
    • http://duxuramubot.epizy.com/what_is_formative_assessment_in_education.pdfIn PDF document text
    • http://wowadepadon.rf.gd/fufejikulavutuxubeturat.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/cloud_9_vapor_lounge_west_chester_township_oh.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_090271097398443b9d0abf71a6fe3515.pdf?index=trueIn PDF document text
    • http://kikexufan.epizy.com/10859938669.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/a_level_statistics_normal_distribution_table.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_b47dadb9beea4fc48d4f7eec0da6fdff.pdf?index=trueIn PDF document text
    • http://biliwaxakob.rf.gd/downward_arrow_worksheet.pdfIn PDF document text
    • http://mevumum.epizy.com/sefogenomebekaxarogupot.pdfIn PDF document text
    • http://jatamez.epizy.com/dedupelutuve.pdfIn PDF document text
    • http://buvodadixasiz.epizy.com/bulb_smash_apk_uptodown.pdfIn PDF document text
    • http://rudikagonon.rf.gd/alexander_pope_as_a_critic.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/4710250833.pdfIn PDF document text
    • http://wexewowi.rf.gd/30510676918.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/22._how_many_chickens_would_it_take_to_kill_an_elephant.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/samsung_tv_remote_service_mode_code.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_ceda6e304a564734afe525e2a163525e.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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 5052 bytes
SHA-256: 1d695dd4198af728402cdc4c75be306ebabc21e2093c9e7d6030079ef2e6f9fd
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 11668 bytes
SHA-256: 9cd58705bb921629b7965cfa6a4c81132beb1cfc47a166da6e1db78dfa3d7878