Malicious PDF — malware analysis report

Static analysis result for SHA-256 998232d3c26302f2…

MALICIOUS

PDF

73.2 KB Created: 2021-05-01 23:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb1b657ea2e74ee69f96004063732995 SHA-1: b314d795df659986b1391b7452e28f7bad229262 SHA-256: 998232d3c26302f2c45da6a9fd8cd2a5d136bdb5c538678c6457dec7bffe014f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 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.
  • 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://vilenefex.ru/strik?utm_term=fanuc+31i+b5+programming+manual PDF link annotation
    • http://vazutiz.iblogger.org/what_transmission_does_husqvarna_use.pdfIn PDF document text
    • http://fozivot.mypressonline.com/agni_siragugal_free_download_in_tamil.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/45253605809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_5ffece94469b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5fe63a673b58d.pdfIn PDF document text
    • http://favarivizuna.medianewsonline.com/19075554512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_5fd83855d58d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_6063422397709.pdfIn PDF document text
    • http://nadozigipak.22web.org/57665055006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_56592b0d60b34017980165346fd22e56.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_d9dd89fc7ad04197b95fe5d745cd94c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3f946a-0c65-4563-835c-a54281d5d66d/86190323809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f27bf4f-3b91-4c48-a3a9-8df90d5953e1/430429941.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/vonukutodupinu.pdfIn PDF document text
    • http://genibadelanaf.epizy.com/vufatototunaridesulobixaw.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_fce42c4635804c42918c0e02bc2abf4d.pdf?index=trueIn PDF document text
    • http://tojederetesez.epizy.com/90477089581.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_189c2bb2ec2d43108aca7cb98abe47b6.pdf?index=trueIn PDF document text
    • http://duribolatajofa.atwebpages.com/tafabobofiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bc1666-f7de-4f9f-bc3c-8cf147be9404/ragotevosabeloduxodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d360064-c232-4b18-ae6d-6aacb70b112c/ms_excel_tutorial_for_beginners_ppt.pdfIn PDF document text
    • http://mupisogedosido.epizy.com/roald_dahl_collection_16-book_boxed_set_2018_edition.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 5508 bytes
SHA-256: 7d09a066dd9dbf108ff329c76b9e01c5698c428b313e4d405c3d1ea2c8095f28
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 11520 bytes
SHA-256: b08ecf50bb6553b3084d0820ed517967ba4b42da411fe0bd94d78bea8ff0d148

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