Malicious PDF — malware analysis report

Static analysis result for SHA-256 611efee3042082fc…

MALICIOUS

PDF

66.4 KB Created: 2021-03-12 12:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a3deb213be1106572b35496a8d1ffe9a SHA-1: cf80c5857421f42c14f69dec7d60980b757bf212 SHA-256: 611efee3042082fc3d30fb6b8687cdbe24eb745e2f856dd6c365d5c0ce20f984
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially harmful content or phishing sites.

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://fokemale.ru/123?utm_term=all+cartoon+love+wallpaper PDF link annotation
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/45ef1b0ab3150e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_60242424046f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_60265f9bb951b.pdfIn PDF document text
    • http://zopaxonurur.iblogger.org/born_to_run_1993_movie_free.pdfIn PDF document text
    • http://gasomenuza.iblogger.org/formidable_charles_aznavour_testo_e_traduzione.pdfIn PDF document text
    • https://zuverikaniwofu.weebly.com/uploads/1/3/4/1/134108987/joxefa.pdfIn PDF document text
    • https://zutiwemozebej.weebly.com/uploads/1/3/2/7/132712207/wofipalagoj-lelekuzeforos-mosoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotikovan.rf.gd/what_is_freely_chosen_self_directed_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e88001-c3fa-4ee6-b75c-857c0d889b9e/dd_3.5_epic_feats_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bdc0f5f-e8cc-497a-9d72-74dfd6610400/37625421534.pdfIn PDF document text
    • http://xuresubonadijif.epizy.com/48472927492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704259f1-441f-41f4-a409-bf7bec5a41dd/57044419856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071ffd6a-b9de-41c3-9b29-ee9da00e3851/nuzazaxobirufijululefujak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31a7d62-7cae-4171-956a-68c167024425/xitaxik.pdfIn PDF document text
    • http://mutodilevo.epizy.com/best_korean_mask_sheet_for_oily_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be33154c-01d9-4a87-b778-f612ebfdebcc/sketchup_3d_warehouse_free_download_2015.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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 4888 bytes
SHA-256: df1cb2dc62709e5a929cea66b836de97eb2c465cfe2731f39e2a4c795a052be8
font_01_sfnt_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10324 bytes
SHA-256: d8d1903ab2d05f23b5d74bc9e800e51b0eb4b1f234ae762e4b343cac9a5413d5

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