Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e707acf9eb7251…

MALICIOUS

PDF

83.0 KB Created: 2021-03-30 07:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e948c53ef7f7316ebd21bacb2d66fd37 SHA-1: 7f3b9415d0ebad17e07bfe279ad6a3e549fa4821 SHA-256: 70e707acf9eb7251cb492e6a4c6ea05d849a88552c2cda5f32051668d70b0ca1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards an attempt to manipulate search engine results or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=la+iliada+analisis+pdf PDF link annotation
    • http://viwavorikag.22web.org/pesirizusejalilavefeler.pdfIn PDF document text
    • https://luzoxunijasuw.weebly.com/uploads/1/3/4/3/134338954/totepo.pdfIn PDF document text
    • https://bonavipopugob.weebly.com/uploads/1/3/2/3/132302892/wapopusipadepazaxok.pdfIn PDF document text
    • https://bekujorukop.weebly.com/uploads/1/3/4/0/134016765/b1362ecfa.pdfIn PDF document text
    • https://pexefosakojoma.weebly.com/uploads/1/3/1/4/131406105/b2837efd.pdfIn PDF document text
    • http://mipasotul.22web.org/venuv.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/rinitu_pijiwesum_pomenudemoti_wodopapovedamuv.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/70d676f5.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/pamififezazijufa.pdfIn PDF document text
    • https://gibolavisijubaz.weebly.com/uploads/1/3/0/8/130813033/87f96f31ae846.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/f9c27293-88e8-43db-a677-85b9c364356f/65337348524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06182d21-cd57-47d5-8c11-dbd6f6279e4c/22536736933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd90eeaa-e959-4b59-a895-bd06c94fabaf/nueva_ley_laboral_2020_puerto_rico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762d3113-e6f5-4ecf-bb21-9b6a45a05447/64932243897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91874be-73f9-4406-a6ea-a0431cfb7ba6/solution_set_of_quadratic_equation_calculator.pdfIn PDF document text
    • http://wowipakusese.epizy.com/internal_audit_manager_salary_houston.pdfIn PDF document text
    • http://nimetegukixiz.rf.gd/angelina_ballerina_books.pdfIn PDF document text
    • http://kalumeli.rf.gd/regiwomudevure.pdfIn PDF document text
    • http://suvowafavij.epizy.com/dezuzalubaxelugazafur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4219a5-4e56-4c51-aa86-9e48e2e6ad28/57013631228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9332ed5b-f4be-4743-a4d3-183e8c43c1d7/2000_chevy_s10_rust_repair_panels.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 4880 bytes
SHA-256: 0e54f273f5a492321a443a1d0c9942e87a2672b1e60acce9b8265e50d85558bb
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 11972 bytes
SHA-256: e193c2e7abcc95da435333603098d7e835c9881616d73230e084718c7a262126
font_02_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 16144 bytes
SHA-256: 89fb4cb0e03d0651222735942ed00a203783669e61652b29c0ae4e378b8446a7