Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e40fb56c94aff12…

MALICIOUS

PDF

141.6 KB Created: 2021-04-02 11:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 447acb17899908d16e04c583befc8398 SHA-1: eb9e8aa07db30d2dee913145f28d74100006cd08 SHA-256: 8e40fb56c94aff12b4563b4dd56bb7996ecc7a117bed722f1fb303cb4e8c8ee5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://crophysi.ru/123?utm_term=joint+health+and+safety+committee+minutes+template PDF link annotation
    • http://wamipivifubape.sportsontheweb.net/assistant_teacher_seat_plan.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/dejabuvaresaz.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/xadopuwaleba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5552838c-34dd-4b1d-99c4-8e66d6d79af5/boy_scouts_picking_up_christmas_trees.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/nemijoso.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/29860159744.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_3edddb8aaa734c429084d9e9e6425573.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_f6c68e5c85dc4e7dbbc1715b3af06055.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_5dbd8209357c4f65b504fb48a7de2a83.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_3ce810ce42bd4813a3c9477e859c97e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12140595-9a0d-4030-8719-912933889193/computer_system_validation_engineer_resume.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_8be4a1c468114706aa79d0538e77db8b.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_3cb8f74cbdb64cd79cb8205175bb1c75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojaxub/sonatob.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_2a82d9143c724313ac8753b37a5c1e80.pdf?index=trueIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_b2674d60bff94f398129efe96298456a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0978d60-ada5-4e99-92c4-7ca466e2014c/first_edition_copy_of_mastering_the_art_of_french_cooking.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_2981219d86094c5081782c9fb33523f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/nail_shop_near_me_cordova_tn.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_b46c6330ecd34edea41cf3b09a13bc4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/resident_evil_4_apk_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff7f3ec-339c-473c-8d3c-a38f514d68eb/40105738003.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_off0001ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECCA 5392 bytes
SHA-256: c9181615e3324b4567bab92c279fe0312a385db194ee4a5f7332478f923fe62f
font_01_sfnt_off0001ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF0B 12100 bytes
SHA-256: f7d0bc13cadd2bd7f548acd5f9cdc957ca19aa2423103cb21af4d69ee0b0fc93

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