Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb8f861277de6fa…

MALICIOUS

PDF

75.2 KB Created: 2021-04-26 05:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c867c9022f897ddede7c7cf19b50d7be SHA-1: 27f873150ddaa94957c9ffe5d0c3d230015a6461 SHA-256: bbb8f861277de6facd7c818a3185cb8f20f9df97db5f4f30f038962a60594bc1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=what+are+the+five+freedoms+in+the+first+amendment+and+what+do+they+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420761/normal_5fee98304a4aa.pdfIn PDF document text
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/jijesegowifopeki.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/fieDzX2/the_art_of_war_book_amazon_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_606acad785377.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_6008f1113bcab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_60435546227db.pdfIn PDF document text
    • http://mareson.getenjoyment.net/sordelli_microbiologia.pdfIn PDF document text
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/bamekisajupabij-pekifikatuje.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/86059ef760b2643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_601b4bb81e820.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/nirixekuki.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/R3jaihg/51801403657.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/fdf29e78-0453-453f-8830-0bd05addb014/wevopasononi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8cf83e-4866-41bc-88b4-8e8e13d9d6d6/how_to_check_temperature_with_braun_ear_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799f3c1e-a893-4ba0-ac16-9c70ab312221/reset_frigidaire_affinity_top_load_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44dd1b6c-d982-4397-8456-f27d8cb15188/fokunixosifatujunenu.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/wajapexuziged.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/zikumena.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/turezevifenikuxusaxemub.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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 5384 bytes
SHA-256: 99c300deeb215ee9454986b5f2a5949a2471c8faba556cbf549bccc96f561353
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 10688 bytes
SHA-256: 79b75f141b7700596ec2b404fae7fc4116f642bc28ae9b257f5133f39b722e09