Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6f3210a4ae110f…

MALICIOUS

PDF

93.4 KB Created: 2021-03-18 10:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 268c4ee3b0c1b9653aba5cfb3b3fb9ea SHA-1: 139209e9f48c38c887f7c09bf834379dc642d551 SHA-256: 2b6f3210a4ae110fedff19c4868c565efa7409e5090b85d0f749c4e5818c1611
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 0.9998

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 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://botokaw.ru/strik?utm_term=predator+2000+inverter+generator+coupon PDF link annotation
    • https://cdn.sqhk.co/sivefuxonix/dvKjaha/voxufurotifujudobuji.pdfIn PDF document text
    • http://joblanc.xyz/best_day_trading_books_for_indian_stock_marketwt909.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/ajdiihj/gemidogog.pdfIn PDF document text
    • http://brumbum6.xyz/bekibapewidikejdv9e.pdfIn PDF document text
    • http://info-pages.ru/710694733w63qc.pdfIn PDF document text
    • http://koxudizujan.mywebcommunity.org/75406744611.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/YgfhdP7/41065251969.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/cff9c8ff-238e-4d21-a097-8f121eecca6d/24559140621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972f171a-d2e7-436e-9f5b-a61241650673/36387315638.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/asp.net_mvc_or_asp.net_core_mvc.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/suxifutenuwez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c82a7b-b0f6-449f-a369-c85c92f56b9b/possessive_pronouns_exercises_for_beginners_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e76d9dd-106b-4c83-885b-afdad01d23c1/tagopuviwupopuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98183af-3961-403c-ae83-56316ae33044/7548821249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ed288b-2254-4834-954c-0f51382b083b/how_to_reduce_shoreline_erosion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38bf057-b375-4715-add1-485036097485/3115569468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61493447-9b32-4cee-b7d4-0659a3c6a531/dikuxenezaxijidozeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6439a6ea-41df-4aef-962b-a866e432c8bf/i_am_that_guy_meme.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_off00012cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 5364 bytes
SHA-256: 27604e7a64362e831036424650612a2b18186fcf896602ae5c2e67fb0c8b36a5
font_01_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 12384 bytes
SHA-256: 5e4cdaa298f816eaf6184b2a1ba81b0bc9ad1f577eca68047732132b58c6e56e

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