Malicious PDF — malware analysis report

Static analysis result for SHA-256 7092064f8b8489b1…

MALICIOUS

PDF

80.3 KB Created: 2021-03-10 13:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05ce3ccef428e6eed8cad0ba2fa795d9 SHA-1: 547e6aea3a9c6a399f16c6c4ca6e1fe7ce405a83 SHA-256: 7092064f8b8489b189db2c2c824b77427d1dbbf84eaa0c7b3c508ee602c6a8d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, many pointing to documents with SEO-like titles, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://resalured.ru/wb?keyword=how%20to%20use%20boss%20fs-5u', is likely a lure to a malicious site. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://resalured.ru/wb?keyword=how%20to%20use%20boss%20fs-5u PDF link annotation
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/6b33cf8a5ffe5.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/cqPjggh/61570117611.pdfIn PDF document text
    • https://cdn.sqhk.co/gufulixofoma/bhchagj/4626075822.pdfIn PDF document text
    • https://vozabamoz.weebly.com/uploads/1/3/5/9/135959881/8734532.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/zokuda-tusetasuw-goxukazidis.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/conditional_verb_mood_worksheet227t3.pdfIn PDF document text
    • https://vutuwibomakupir.weebly.com/uploads/1/3/2/7/132740747/binobe_tixatupajuves_moweru.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/hjScCyj/92327691830.pdfIn PDF document text
    • http://kkkirrreeee.space/401377816895x9ry.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/nozasawabuk-tezopipufesuti-toveveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/14416f15-8780-43bd-bea6-7aec1cbf8c7e/yaskawa_p7_fault_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5895d6-93c2-44fc-87ba-fe633d55f207/special_education_in_contemporary_society_6th_edition_isbn.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/technical_documentation_software_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efa8727-779f-4547-9a62-1f22349d5209/chicago_style_in_text_citations.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/toduzilo.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/65851836407.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/bugera_v22_bias_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e5eb66-9977-4d56-a643-a5553bb6eaf8/a_history_of_western_music_download.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/vosativatab.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/5019676632.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/beaglebone_black_wireless_reference_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 4500 bytes
SHA-256: e57ff4b47149679d21f76e77eb335616a8ec6971a5368713d0dc8914d22b1da7
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 11024 bytes
SHA-256: c5524b9598301e6dfc669acbf0963810797bb52deebcd5fd5fcb497ca3e4ad7a
font_02_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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