Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb57a40b46764b5…

MALICIOUS

PDF

72.0 KB Created: 2020-12-27 19:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b17a9ead0c226dad46d544cf82b5bec1 SHA-1: 3434a69a17b870e833ebddc2691b5e24e7165dcf SHA-256: 7eb57a40b46764b538bbface812f1d161e8f6958eae83ca8a761814a72598ccd
344 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document is identified as malicious by multiple heuristics, including ML classification and ClamAV. It impersonates Gmail and presents a lure for a Google Chrome installer, which is a common tactic for credential phishing and malware distribution. The document contains numerous links to disposable hosting sites, likely serving as a link farm to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/3526066.pdf.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://gettraff.ru/aws?utm_term=google+chrome+offline+installer+free++2018 In PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/3526066.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/5170365.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/306110.pdfIn PDF document text
    • https://wusikizojig.weebly.com/uploads/1/3/4/8/134883510/c6819f2b10.pdfIn PDF document text
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/9216439.pdfIn PDF document text
    • https://foruvojupizife.weebly.com/uploads/1/3/4/3/134352799/sujamu.pdfIn PDF document text
    • https://mexarufuwusa.weebly.com/uploads/1/3/4/5/134599415/foxudefedapebi_bafogogukin_wobapug.pdfIn PDF document text
    • https://divoguwobumiwes.weebly.com/uploads/1/3/4/4/134487338/849942057.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/ganefuwujozo_satokoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f8f67d70d96d.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/Ja2ifii/rozixepufifasogof.pdfIn PDF document text
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/c32079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fa73b1d2f2bf.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/4671fc04-0e68-40cd-9791-5a9a093596e1/download_city_of_ashes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86044a0d-ea81-4756-89a5-1ac2d44d9c22/35782495214.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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 5844 bytes
SHA-256: b6369436e2a820384356de90c7a34b8e3d2a8ed6e5226186f9a455fcabbd0973
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 10668 bytes
SHA-256: 5521b432b9a4053b5881c336059de5de2ed39906278cd20ff6d79b80aa1943e3

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