Malicious PDF — malware analysis report

Static analysis result for SHA-256 9648f9fa840d841e…

MALICIOUS

PDF

92.1 KB Created: 2021-03-07 00:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: e3f568f95b860ae217111e60a4488e33 SHA-1: 476978c3e842113d15deb4259232d53bad30d3c6 SHA-256: 9648f9fa840d841ebcb61cc2f5dd68c0829cb98238d44ca1b21585002da542d7
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The primary purpose appears to be directing users to a network of websites, indicated by URLs like 'fokemale.ru' and 'fruit-italy.space', which host numerous PDF files. This behavior is consistent with SEO manipulation or serving as a distribution point for other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=sql+for+dummies+2020+pdf+2019 PDF link annotation
    • http://fruit-italy.space/kenmore_smartwash_dishwasher_wont_drainua5e5.pdfIn PDF document text
    • http://finansi-7.online/motolaxisidavek4c9aw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_6021a81736217.pdfIn PDF document text
    • https://duvetuxivana.weebly.com/uploads/1/3/3/9/133999993/bosuz.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/cartina_stradale_basilicata.pdfIn PDF document text
    • http://affilateapp.online/how_to_become_an_apprentice_welder_in_albertat1z1m.pdfIn PDF document text
    • http://1ux.site/bharathiar_university_ug_books_download7bnvu.pdfIn PDF document text
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/7500051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_601f11c486991.pdfIn PDF document text
    • http://d2-club.ru/aimesh_ac1750_wifi_system_rt-ac66u_b1_2_packoy757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_60348b4ade348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_dbc27d076b1a4f76b24c18788ae97e22.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_084a4c046a96465ea9fbf265f3d00035.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_b89b4750a8654da68e4a551b9ac78361.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_62c813f5598b493cad4ad4d47a7d55df.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_5828443505184ac0a432b38c04beb494.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_032df54af44046b2a0e67d0ebee2abc0.pdf?index=trueIn PDF document text
    • http://bibuligo.epizy.com/32470554579.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 5384 bytes
SHA-256: 3c0e42c2fdb4b560460c6d2e5aa93804c859e82bee38c228b1fdc99ab5bb5c81
font_01_sfnt_off00012c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C41 11536 bytes
SHA-256: 40c09bdbbf2cbce90c3b2e7ec5ae15004c5b91c123a9af56a1a4ccd61a5fb383
font_02_sfnt_off0001539a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2