Malicious PDF — malware analysis report

Static analysis result for SHA-256 3834a2863eee0a58…

MALICIOUS

PDF

84.1 KB Created: 2021-05-13 21:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 15a0a410d2ecf92117effc1f18ab37e5 SHA-1: b7383a120f426c1e3f5fecf5e65388f8b75b8f8a SHA-256: 3834a2863eee0a584e04932278cb2ea439740d465cc5e21f075c9500d7cf81a5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded links are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+avoid+day+trader+pattern PDF link annotation
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/gugolenafer_safoxudiruja.pdfIn PDF document text
    • http://xuvalikamug.22web.org/ajith_billa_audio_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/aij4ljh/89968714191.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/89879450862.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/iisjhgf/bunigojawidofu.pdfIn PDF document text
    • https://bitoranajezope.weebly.com/uploads/1/3/1/4/131453137/nasudakixopoma.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/f9ho0P5/79742716969.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/arthur_schopenhauer_books.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/bHJjijf/34800060152.pdfIn PDF document text
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/vidopupolixesubiwaso.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/ifLKij5/iga_friendly_grocers_sunshine_north_vic.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/fupobepaw.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/gdjbhi0/51478874021.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/DjjjesP/46745446321.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/djcgije/snapseed_desktop_windows_full_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_a4b5a2ff759b40999f030c2cdeaf9602.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_80f9ab3506494026b7c5202f5bac564a.pdf?index=trueIn PDF document text
    • http://tediguku.atwebpages.com/how_to_load_bobbin_brother_sewing_machine.pdfIn PDF document text
    • http://lefumes.rf.gd/neluwukuwexamolidomodu.pdfIn PDF document text
    • http://jaxarafepemu.epizy.com/31888193346.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_de7084a1a38146578267aa7edb9259f1.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_033c88a15f0347218873805e08f8a75f.pdf?index=trueIn PDF document text
    • http://vurasoda.rf.gd/artificial_intelligence_a_modern_approach_3rd_edition_solutions_manual.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_bc38f69ecd2c473dac964eae484eac7e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 4956 bytes
SHA-256: 510724462ce67c6712c97cf5686bb4c8e4e9f056415a3c9480539acfd6fae2a8
font_01_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 11092 bytes
SHA-256: e41e6943738fbad850972c80f80ec1b44f246417c9df467888e17b4de33630a3