Malicious PDF — malware analysis report

Static analysis result for SHA-256 9153edb95dfd4a76…

MALICIOUS

PDF

73.2 KB Created: 2021-03-11 01:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a88463ced90ef47502ad84aedd0036f4 SHA-1: b3797df61b6cc12d73377572e7f550ed66c1858f SHA-256: 9153edb95dfd4a76489c1a30367e0f388d3edaf30433e1352cabf24d44f99e03
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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/award?keyword=portugu%25C3%25AAs+xxi+1+pdf PDF link annotation
    • https://cdn.sqhk.co/jenetuwuda/hRbPfwP/android_adaptive_icon_tool.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/18575025570.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/gcJqYhj/furelinomodanurevazuvug.pdfIn PDF document text
    • https://xemiwiwoxotewa.weebly.com/uploads/1/3/5/3/135325065/f50641fc404.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/CKPthgY/tavapupexororike.pdfIn PDF document text
    • http://artemk.ru/pokemon_game_lets_go_pikachu_download_apkvqu5t.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/iafhj5q/xufetarewufefow.pdfIn PDF document text
    • http://afracheat5.xyz/official_hige_dandism_report_rarx96co.pdfIn PDF document text
    • https://fozibopabedabe.weebly.com/uploads/1/3/6/0/136082219/gisil.pdfIn PDF document text
    • https://tepojaja.weebly.com/uploads/1/3/5/9/135966759/ec3d143.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/WRRghha/benjie_k10_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_6010047e2e3e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_601327335bcc9.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/jobalolugejuterajatikig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_aebef3ef7a5c43cea85533b6df058ab8.pdf?index=trueIn PDF document text
    • http://xogijowag.onlinewebshop.net/10771305568.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/apush_period_4_review_quiz.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_49676f85fa5d4d96a7c2f65a85eefd1a.pdf?index=trueIn 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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 5236 bytes
SHA-256: fa170cc0b33d0ac3c352e1fdaa0d6e6aaa63785b218fc0fe9f46a96d9c8d0ce9
font_01_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 12476 bytes
SHA-256: f8a668207eca20e4661a3bda229497eb69de98bcaf6d2f291e5d3f12a08c3c1a

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