Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8a6b9fbacc741c…

MALICIOUS

PDF

67.9 KB Created: 2021-03-18 23:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a626d6247af258fabc7801f01e09da72 SHA-1: 9f17f0e50561c9de0a01c3846cf10afce2f4026e SHA-256: 0e8a6b9fbacc741cb4297fd81fc9c7d29970fd0e86c7d1382e2f5b6beee0dd33
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 0.9996

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://seumenha.ru/award?keyword=asfixia+perinatal+fisiopatologia+pdf PDF link annotation
    • https://cdn.sqhk.co/moserusoba/ieHiiCe/65965819333.pdfIn PDF document text
    • http://hyipinvest.site/plantronics_backbeat_fit_hard_resetoa9a4.pdfIn PDF document text
    • https://komipakokituk.weebly.com/uploads/1/3/5/9/135993761/deloramasuk.pdfIn PDF document text
    • http://stepka2016.xyz/home_design_3d_apk_free7n88k.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/jeketiwirevuje.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/rurar.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/8571395.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/AAIQdif/97092551310.pdfIn PDF document text
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/jepogez.pdfIn PDF document text
    • http://artistichomesolutions.com/molecular_and_cellular_biology_impact_factor_bioxbiomcmtj.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/BjheifB/virtual_truck_manager_tycoon_trucking_company_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwokosokif/1wRgfhg/90445636960.pdfIn PDF document text
    • https://zewerigavuj.weebly.com/uploads/1/3/2/6/132681779/bepubata_zuvovujo.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/dkjexkk/anthem_bcbs_california_reconsideration_form.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/h99LLML/official_army_prt_app.pdfIn PDF document text
    • http://nefritthebestthing.site/toyota_lexus_techstream_key_programming_manualsevxbc.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/f6774a1b-0b94-4d0e-ae4d-6aac792932d2/18771843498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f543641-5602-41df-af9a-bd8155759376/jarepuxezolibexovirupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/794445c6-d311-4f63-a077-ec2496a67c02/nonagagumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c7fce4-bd78-4f7e-a45f-5df1610396d1/71603913705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8b9ff0-c64f-4afe-a96a-5e22e31947bc/watch_the_secret_history_of_writing.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_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 5264 bytes
SHA-256: 5898392d8f32ca2518f4fe372ae7796212ec9acffe011a74bc7afbceaf6cedf5
font_01_sfnt_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 11184 bytes
SHA-256: 05e35a9ff972c83e85552cf5c8090acee33133e9fb86ff07539cc63eac954324

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