Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670c1a764ce98d9…

MALICIOUS

PDF

59.9 KB Created: 2020-11-10 11:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: eb8ce5b4b7bdea4f2e1e7bf2347acda4 SHA-1: ea001b47f0b02767f872c99ea5cfa63d24fdfb21 SHA-256: 6670c1a764ce98d9130d117bd9007ed301e2edeb5a9c355851b46f62424b080f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged the document as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://traffset.ru/aws?keyword=is+seatgeek+legit+reddit PDF link annotation
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/lokijukekevi.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/3f295ca1.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/55dff.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/2556250.pdfIn PDF document text
    • https://sefufomoxuve.weebly.com/uploads/1/3/4/5/134528328/4097042.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/2205647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/abecedario_para_nios_de_kinder.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/san_diego_union_tribune_obituaries_submit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35545ebe-4af5-4ecf-acec-1a457465945c/zakivazaxibilapiwed.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/nawepukanotejuvusuve.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/current_cm_list_of_india.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/partnership_contract_sample.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_off0000af24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF24 4992 bytes
SHA-256: cd266d154eade7e960744ed646f4026098361c80bab39c30ec2444b19cbb27c7
font_01_sfnt_off0000c033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC033 10336 bytes
SHA-256: 4a23bdd86fc0dd90f33e43fbbbb268f3a73f360c91dd0aee183117d41f8387e2