Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aaaa16d677946a…

MALICIOUS

PDF

71.3 KB Created: 2021-05-27 23:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c24189ce5a2975d3a539c31effc4349 SHA-1: 88c626493160588255cfeb2210a5a319bba01c76 SHA-256: 21aaaa16d677946a1f0ce688241eafe54e19242b9168bcab00f79fe0e81eab8b
186 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 0.9997

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://gimoguvi.ru/strik?utm_term=co%25C4%259Frafya+10.s%25C4%25B1n%25C4%25B1f+online+test+%25C3%25A7%25C3%25B6z PDF link annotation
    • https://buxevuforuwax.weebly.com/uploads/1/3/2/6/132680831/494584.pdfIn PDF document text
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/liluvubofod-kajikeva.pdfIn PDF document text
    • https://wegizazuxiri.weebly.com/uploads/1/3/0/8/130814830/namebeveg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5ff8ee3675292.pdfIn PDF document text
    • https://mibiduzomezo.weebly.com/uploads/1/3/5/3/135327428/1b38f9dce78fad.pdfIn PDF document text
    • https://lisujawot.weebly.com/uploads/1/3/6/0/136024823/bimabiposikop-pijide-vepitiwo-xuzajomivajoted.pdfIn PDF document text
    • https://jabezenenadako.weebly.com/uploads/1/3/4/2/134234778/4548199bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_6021592f6cc6b.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/xuwediriwu_rutigoli_besabivowep_zotemomituxafoj.pdfIn PDF document text
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/1441bf451465c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_6054d5688885f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_604492b860b5d.pdfIn PDF document text
    • https://xewuligatojijow.weebly.com/uploads/1/3/5/3/135395235/febofe-nomasadupa-timubakul-lopapezominox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488592/normal_60677cf9da866.pdfIn PDF document text
    • https://juvobekini.weebly.com/uploads/1/3/4/3/134384538/pewakolowuvobi-vetasilesil-tinidoxofoma.pdfIn PDF document text
    • https://nepexinis.weebly.com/uploads/1/3/1/4/131438592/a558a7b.pdfIn PDF document text
    • https://leladuginaxiwo.weebly.com/uploads/1/3/5/3/135320554/tuwuveram.pdfIn PDF document text
    • https://rufukowov.weebly.com/uploads/1/3/4/6/134665675/dufizotoxopuduwu.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/ceeb8216-e123-41df-ba6b-fcfb9cf927a6/ghost_in_the_shell_manga_panel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c74cea-7873-46aa-b40c-c4b9d036d47b/67390475045.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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 5624 bytes
SHA-256: 857865993d6c96d86c30efb78bb499ef2ab1aa5890c46855f00aabaea504566e
font_01_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 12116 bytes
SHA-256: 219a9c46c721f5d07ab259735b9d6c282a91479fc9eec8c16fc86f774a9fb7f9