Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e26311faa64e86f…

MALICIOUS

PDF

83.9 KB Created: 2021-02-24 13:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a4ac55f12e7dc2eac07bb92e08523c2d SHA-1: 4d4782b9a0d46c45aa84346a8d14f6af27ad0d54 SHA-256: 3e26311faa64e86f5b9d19dae31f548075a57650c8816d37cb3968ee4beff917
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. Heuristics indicate a high volume of links, some hosted on disposable domains, suggesting an attempt to obscure the true destination or distribute phishing lures. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=black+desert+ranger+guide+2020 PDF link annotation
    • https://cdn.sqhk.co/nifodotiriru/gigd6jh/70516075059.pdfIn PDF document text
    • https://cdn.sqhk.co/dojoxuwote/AhaijhV/xotixezewefunas.pdfIn PDF document text
    • http://spencermcman.us/norifapuzuwakaxasijwerae.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/76289739271qgin1.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/Dhj8D64/mobile_recharge_offers_online_jio.pdfIn PDF document text
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/sotezitudo.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/WHb4if4/tegiramikilavon.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/MpihieE/pavefevarutodajirawutiv.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/vpn_browser_for_windows_843tit.pdfIn PDF document text
    • http://poroda.site/64562941173rtcd4.pdfIn PDF document text
    • http://test123test.xyz/brain_teasers_and_riddles_for_adults8l895.pdfIn PDF document text
    • http://vir-tus.com/95588348188wlm54.pdfIn PDF document text
    • http://hookup681.site/redupinogubawh7egt.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/ghib4hh/zemaruvejiguliwojip.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/fatadurok.pdfIn PDF document text
    • http://semengergel.ru/89111786160wi1ap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 5496 bytes
SHA-256: 9744716a0718398956bb55756415c12c16ab0027c31d6382cc5d79f382e7a560
font_01_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 10888 bytes
SHA-256: 0d2438eddcd541145b7590f00e6bf3d06fdfb2a7fe2d1810b403a0d78d56bcac

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