Malicious PDF — malware analysis report

Static analysis result for SHA-256 40630e7c9e087f87…

MALICIOUS

PDF

73.2 KB Created: 2021-04-04 11:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 58fd9b9c2448ef68fe4c3848330a7de0 SHA-1: d582be0f5a3cbe16841253bc581fe7b1e53e46c3 SHA-256: 40630e7c9e087f87df969be2b5467f9b3705d60762baccb9fd2f5eeec1d59cd1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content through a large number of outbound links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=rinnai+glo-ray+propane+heater+parts PDF link annotation
    • https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/kojokot-xamemuluwinij.pdfIn PDF document text
    • https://mulaxenowaw.weebly.com/uploads/1/3/4/8/134862071/ribazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_6063dd90abe23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_604fa6b0eb745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fda8154ee6f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_601fee8f73b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_6013c3ef51c38.pdfIn PDF document text
    • http://rollernefrit.xyz/costco_baby_car_seat_and_strollerlms71.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/0a6d1d8ed0e051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_605cb6f788014.pdfIn PDF document text
    • https://xilinupuvawede.weebly.com/uploads/1/3/5/3/135350476/6375d65c55f27.pdfIn PDF document text
    • https://gusoberususot.weebly.com/uploads/1/3/1/4/131454899/mareruxizot_rinejegitu_telimumi.pdfIn PDF document text
    • http://mscgis.net/m-audio_code_49_usb_midi_keyboardpp1ji.pdfIn PDF document text
    • http://zelopaqq.xyz/lexus_is300_ls_swap7rndn.pdfIn PDF document text
    • http://flowerport.market/fuminepajixesolisb6hlp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6054aa5398239.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/why_did_hugo_weaving_hates_red_skull5l8cj.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/4f523f517586d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384037/normal_5ff15a0d4721f.pdfIn PDF document text
    • https://dazuneluxenewag.weebly.com/uploads/1/3/4/3/134316856/5357550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 5220 bytes
SHA-256: 07599351d981982f05e619b54ece278dd9d15088e5ea82028fd56f5b047660cf
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 11092 bytes
SHA-256: fd5ba8e59b958f0896302471aa7243b997fc4ef87fca9e6774ccee7d9b96873c

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