Malicious PDF — malware analysis report

Static analysis result for SHA-256 828c1595e1101ee7…

MALICIOUS

PDF

72.2 KB Created: 2021-03-25 15:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 41326d28ab94e1ed3185fd95c5c6513c SHA-1: 57b0ceab27a402f036694f79bfb0205eb11f0d62 SHA-256: 828c1595e1101ee7e873f826023a24aac428164fc11714dc22c57e3a1a994bd6
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 0.9998

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://midufefew.ru/strik?utm_term=the+heart+of+yoga+pdf PDF link annotation
    • http://igcopyrightclient.com/1971_ford_mustang_mach_1_hot_wheels34dtj.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/biachim/xijiperogifekawokadaf.pdfIn PDF document text
    • http://zzzmmmmejjj.space/tetuzidolokegufagekuxaa4iz.pdfIn PDF document text
    • http://pochta-24.cc/pocket_primary_care_pocket_notebook_series55icj.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/DubhbKD/64394908195.pdfIn PDF document text
    • http://goproits.com/66454215644qq4r6.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/barron_s_ielts_superpack_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/hcibYl9/letatoromewofopi.pdfIn PDF document text
    • http://orbitan.fun/authorization_to_release_employee_information_templatetpnrb.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/iejc5GP/pujemiwonikewazedawajeti.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/Rgcz8JH/nonufotezemezasaru.pdfIn PDF document text
    • http://winoorama.website/what_does_interdependence_mean_in_an_ecosystem19qy5.pdfIn PDF document text
    • http://rollernefrit.xyz/lalosugobepu7ytp2.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/gpiinJI/makedonsko_devojce_piano_sheet_music.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/58614161572.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/b7Vjfij/94277425659.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/ahigb3X/key_skills_for_library_managers_leadership.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widepidaba.atwebpages.com/how_to_make_your_goals_work.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_9ee16e9f9be7438c948e782f61de9fa8.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_0f5f3450304b4c81a8cbb4bac340c394.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 5144 bytes
SHA-256: b5b5d9cc4f8db3c751d92fae5c840e4d80f293fbf41553df21216b85cf4887ba
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 10032 bytes
SHA-256: a56cb7fbf0424d99007526a543b50a0c74ca119d0f6a0f3bb72731fc8d49aa68

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