Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd3518b4d6703c8…

MALICIOUS

PDF

80.4 KB Created: 2021-03-22 01:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cfadb1a458c71d8e56d5be76095bed2b SHA-1: 2df4e86eecdb11e53c78a8cbb5770d721595f556 SHA-256: efd3518b4d6703c8ad5bb6e5ae7bb8cb1507b0d94f5349cd415431c786599f35
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=what+olympic+games+were+played+in+ancient+greece PDF link annotation
    • https://cdn.sqhk.co/ravuviwidi/d1Pijyl/animal_print_runner_pink.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/7hhhdFO/android_messages_rcs_att.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_6055584379a4e.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/3931862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5fdd82f8de625.pdfIn PDF document text
    • https://wosefekolejareb.weebly.com/uploads/1/3/4/3/134340916/3ed40dfd0d.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/apvinii/buriwiravawajogebafuxi.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/gotigezufekujatuxote.pdfIn PDF document text
    • https://cdn.sqhk.co/lasokixon/djdxheP/13288538539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_5ff664e9ab8c7.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/Aghjijj/student_attendance_app_android_source_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff831de25619.pdfIn PDF document text
    • https://waratonis.weebly.com/uploads/1/3/4/2/134235653/5564455.pdfIn PDF document text
    • https://pexazunawilaga.weebly.com/uploads/1/3/4/2/134265520/nosoniwigejujenok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_602bb1e679bb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_37dc964aee4a4efea60e841a0117483f.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_e12ff71401e94ac19932deb4f57828ec.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_51b2ef218fbf4d8997a8f3059565162b.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_01d6f233ff274024b3a66082ed54c8c0.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_b9c258aa02dc432db2b59afc7d34e242.pdf?index=trueIn PDF document text
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_604f291508d44a0e897c0dd3c09db737.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_e0c7387080fe49ef911d3632b19feac5.pdf?index=trueIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_68184beafe27492fb845d0c32e0f3aeb.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_db2659e89b6b48648bf627879351253e.pdf?index=trueIn 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_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 5696 bytes
SHA-256: 04ca461de41ae1756c6be4df416a8ca8312d1607b10504681fa4ec49f323dc8f
font_01_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 10904 bytes
SHA-256: 78e3252caf20f10cd1780e62f82c13ec2a1057925c27a3f96202fb8d1efbdf05

Open this report in the interactive analyzer, or submit your own file for analysis.