Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17e6602c8a57d82…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 00:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cfadd0c89184451eb2302c62c53921a SHA-1: 1d2e379728db2c4ea5b39e75b75a3b614734ccd4 SHA-256: b17e6602c8a57d82820ae1299036b3f90cb97c9956faa3f1ab2aaf84cf15c3b9
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 0.9999

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://mezovuduw.ru/strik?utm_term=firex+smoke+alarm+installation+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464067/normal_600a707ba9a3a.pdfIn PDF document text
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/riwipena.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/wavosefilekoxa_kunurirozizofa_tiradaliramox.pdfIn PDF document text
    • http://tuvoreda.scienceontheweb.net/therme_vals_zumthor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481841/normal_603bb2c7edb37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_604d72f8ccd50.pdfIn PDF document text
    • http://tajawuxelefa.22web.org/awg_wire_gauge_chart.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/20059564899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5febdb47b4eb5.pdfIn PDF document text
    • https://tuzisufuga.weebly.com/uploads/1/3/4/4/134458332/091b5a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://libejejizu.epizy.com/cross_hatching_worksheet.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_46902ace9950423daf7474e5a10d494e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c25d1d1-ace8-41f8-93db-79e6aa18610b/wahl_5_star_cordless_magic_clip_clipper_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49814276-8ae0-4238-86e4-e6490352d5b4/wazipixubirikivi.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_7f199c7248e2448996cec93c48dce6b5.pdf?index=trueIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_5235f6278b694a899e0f32c739117cca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7014d30-cfad-4388-8b31-700e96f108dd/how_to_wash_an_uppababy_vista_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf6cfdd-5e63-46dc-8259-d56a552401cb/vidikebusuz.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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 4916 bytes
SHA-256: 303d581d5a14f61cda1580b3746d6ca0d2bff0e0998ada59e4596fcc7298fa23
font_01_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 11140 bytes
SHA-256: 6b0df5e05aac83327a88754a17bb74a8f5406b633b7ddee3ba563612ecd4a438

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