Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58260a1920d2f43…

MALICIOUS

PDF

107.5 KB Created: 2021-03-30 02:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1682ebb2b42ad9ac771610b088882c2f SHA-1: d80b94bcb33b538267e41218d58757b21c7c1985 SHA-256: e58260a1920d2f43bbb875a73bead2315f594631201a023d3f8da20877082309
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed for SEO manipulation. One of the primary external URIs, 'https://midufefew.ru/wix?keyword=d-band+center+equation', is likely a gateway to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=d-band+center+equation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375522/normal_6009d8b3c9d54.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/COieggC/lunimuzitaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/jjlhjO3/lugunefigizasaxoratenot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5fe58da86bbc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_604d9d80900ce.pdfIn PDF document text
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/bevixivokufuwanadub.pdfIn PDF document text
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/a3913c8e.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/EPgffgd/toy_soldiers_xbox_360_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/dhcjdib/votokunufadaluxave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fe5cffce1fd2.pdfIn PDF document text
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/gajekek-filubowopogu-vakasobijox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fce65ad58d27.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/tekade.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/UP2jfhb/go_fish_poke_nutrition_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/Sjghdie/xopezosiwatubabefenof.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/b3f91f69-4fe8-4baf-abdd-26199d102351/2005_chevy_malibu_starter_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b137aeb7-222e-4eca-9160-6dcbac372446/first_harry_potter_book_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d91128-79a4-475b-926c-7d6884171d1e/top_10_cloud_computing_companies_in_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841b9ed9-7fa6-4e43-a111-ca4f087e7675/learning_english_for_adults_in_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c5e4b5-588c-4b9d-a0f6-0f9416842db9/72512719200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09485b20-a3d3-4c20-a54f-47ac55318542/9825369694.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D63 5020 bytes
SHA-256: 82c214cb235a838d6116336bbba9f72ebc86bfa39669950ce69a305fef3d3878
font_01_sfnt_off00015e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E86 13496 bytes
SHA-256: a40ab7195264b38b8c64a763845ce9c986112412d7af16f65d77176708cf6c8c
font_02_sfnt_off00018b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B7B 16148 bytes
SHA-256: ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0

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