Malicious PDF — malware analysis report

Static analysis result for SHA-256 326c7efbb9c281b4…

MALICIOUS

PDF

43.8 KB Created: 2020-10-05 07:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c106bbe84515afd11d9542be32be5d9 SHA-1: ebcda7b0c49bd857e237d19bc14a1849d4ebf92a SHA-256: 326c7efbb9c281b4f080f8c1d725ed168644736d5da558f48a28935ea403b411
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=hace+time+expressions+worksheet+pdf In PDF document text
    • http://files.loccapeltva.org/uploads/1/3/2/3/132302736/6789252.pdfIn PDF document text
    • http://befib.happyvalleybaptistchurch.net/uploads/1/3/1/6/131637140/vebikidoru-dexarupedimako-zupema-falita.pdfIn PDF document text
    • http://kolol.twigny.com/uploads/1/3/0/7/130775883/dafifuwitikizem.pdfIn PDF document text
    • http://files.artgymvt.com/uploads/1/3/1/3/131383251/xokejax_dufirirumukix_kopibu.pdfIn PDF document text
    • https://site-1039797.mozfiles.com/files/1039797/59313483145.pdfIn PDF document text
    • https://site-1043796.mozfiles.com/files/1043796/18078800457.pdfIn PDF document text
    • http://bujewu.operationmoonwatch.com/uploads/1/3/0/7/130775503/4589321.pdfIn PDF document text
    • http://files.johnwilliamscounseling.com/uploads/1/3/0/7/130775025/7249548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0491/6962/9350/files/18250943566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8619/9461/files/maine_department_of_education_framework.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2260/4693/files/28260440365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0925/3791/files/birds_of_prey_2020_full_movie_online_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 5336 bytes
SHA-256: 14cda39aec67a27c836f8c428353d89ffa02ecba6ab4efccc99502a438e8583f
font_01_sfnt_off0000717b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717B 10052 bytes
SHA-256: 91edecfe8631bc74081f754c4b49142d533cb8b3e81965483ef709d2c5b6724b
font_02_sfnt_off000093db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93DB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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