Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e5a788439085c0…

MALICIOUS

PDF

89.7 KB Created: 2021-04-08 14:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eccf0899858c1570ada2f2725e8868b5 SHA-1: ca32d58c929ae7bbae32ebeace4e572aa27442e6 SHA-256: 71e5a788439085c0f93cf81d27d4c9ed4ef4a457d35ca9d31982563db508a3ba
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or use UTM parameters, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links points to an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=clarke+130en+mig+welder+for+sale PDF link annotation
    • https://cdn.sqhk.co/jipodipotaj/XjgeTSq/facebook_lite_apk_old_version_2020.pdfIn PDF document text
    • https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/6191499.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/eo7Tqql/98229408903.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/eAhddR4/sipelife.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/pazidep.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/jijd0ia/14652720631.pdfIn PDF document text
    • http://tomorubi.22web.org/jewomiguso.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/gAiJrja/make_your_own_solar_system_model_kit.pdfIn PDF document text
    • https://wanusasa.weebly.com/uploads/1/3/1/0/131070791/5410278.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/8be9f84d-7b48-4356-8bc9-e69949a35e20/60024454901.pdfIn PDF document text
    • http://ranoponadugat.epizy.com/cholesterol_diet_sheet_bda.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_28c7508dc33b41a18b8bb612c2f9e1f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c633a514-d040-4e07-8866-5feb1a0d4348/first_break_all_the_rules_chapter_2_summary.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_86926eb63c7c4f3ea2022917d1f22945.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_23dabdc139d74297b92096b9f9f0e184.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a36e3e3-5ab1-4511-ae7d-3ac265319e59/zobefokupeniremukunu.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_f19008913b6e458fb03e89abad1d6576.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/699399b0-04eb-4f23-8357-27d14d56fec5/suvunifilus.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_7e9e5443e3dc4e07a863be95a2e5e797.pdf?index=trueIn PDF document text
    • http://sikofus.epizy.com/jinja_load_template.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_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 5648 bytes
SHA-256: 876e58d3ca337df2d3f3955b92eb2ba88e68f505872bbff9510191996db01912
font_01_sfnt_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 11316 bytes
SHA-256: f928106c6376bcbc65686d0c08c333fe3922905525c418fc9d5593292e79fc7a