Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2f91552e0b1ef6…

MALICIOUS

PDF

69.4 KB Created: 2021-02-19 07:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e79d1ed08add04dbbbc9086cf6491c33 SHA-1: 70c1112293265d3ef18e3f4e3283b46aaae51d90 SHA-256: 1b2f91552e0b1ef6792a831a8048be8f9ae186bf79606d0507e647bb2f5a782c
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically uses a search query as a lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to external, potentially malicious, content farms. No scripts were extracted, but the overall pattern suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/123?utm_term=what+dog+treats+are+made+in+the+usa PDF link annotation
    • http://jokebixa.22web.org/41575081338.pdfIn PDF document text
    • http://datingsexchat.site/centrifugal_pump_problems_answersowggn.pdfIn PDF document text
    • http://accueilcmb.com/duvuga7cfcm.pdfIn PDF document text
    • http://wazofos.iblogger.org/fimawos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_6024a19702eb4.pdfIn PDF document text
    • http://xilagima.66ghz.com/circle_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff64a8790ebd.pdfIn PDF document text
    • http://balonedud.iblogger.org/tukevuligetazuvetisiwit.pdfIn PDF document text
    • http://creamwalls.online/how_to_pray_for_my_husband_book8kg5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sowujakuje.rf.gd/renuvuw.pdfIn PDF document text
    • http://duvedizokonidu.epizy.com/3598419090.pdfIn PDF document text
    • http://wupubobetob.epizy.com/digunalobudif.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/padusutelo.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/36918285063.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/office_365_admin_portal_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/business_letter_format_sample_with_letterhead.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_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 5220 bytes
SHA-256: 9d799a719d0f11ed84e40c141440733e2caac60bfe428d5a8b9e1c11b15b9362
font_01_sfnt_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 10640 bytes
SHA-256: 9c835b6e9d32fc92a58fbe2ab9e2198a5b267fe8b1092851aefa9667e9c41c5d

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