Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8971f558916788d…

MALICIOUS

PDF

80.0 KB Created: 2021-02-21 19:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2cbb3c28225f73122d974d6dde22356c SHA-1: 10e4d8f9b608641de7a2fe381a39165b612d3db7 SHA-256: e8971f558916788d21792c49cfdd31531f9ada9820587f057404b4aaae98fd67
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 0.9998

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://crophysi.ru/123?utm_term=are+psychoeducational+evaluations+covered+by+insurance PDF link annotation
    • https://pulamawuba.weebly.com/uploads/1/3/0/8/130873907/9edf0b0.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/wudix-ruwamek.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/ganaxamewetekes.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/uoehbgh/left_4_dead_2_minecraft_mod_download_free.pdfIn PDF document text
    • http://fetidasobi.iblogger.org/android_sdk_offline_update.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/3394039.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/iivpich/2468511105.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/6Big2L0/sebebonepiliridubudamiju.pdfIn PDF document text
    • http://ruwegekugite.22web.org/templates_powerpoint_gratis_medicina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natadomemorad.epizy.com/android_developer_jobs_in_pune.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/vukuxevaxebi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/recognising_halves_and_quarters_worksheets.pdfIn PDF document text
    • http://rimuwogiwofu.rf.gd/59752988557.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/chemistry_a_molecular_approach_2nd_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/93604804023.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/cisco_spark_board_55_installation_guide.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_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 5452 bytes
SHA-256: a6d7c072c200af3abf836715f719c8e2ceac0dd7f4e51c3fabc334892ec04511
font_01_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 11076 bytes
SHA-256: 24c90f4da7664846c3744d641102387601ae0f26cde28d1b5d4d9b17aba7b17a

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