Malicious PDF — malware analysis report

Static analysis result for SHA-256 04352181fa8d96bf…

MALICIOUS

PDF

46.2 KB Created: 2020-10-15 16:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b6e3b8f70432504c240004b90e11a287 SHA-1: cd44081a8768f953cd655a734324919cd29db815 SHA-256: 04352181fa8d96bfa2011b0f30124ab9df02015bf1ab4ff2e6b5ae9fdf52f7a3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a harmful site.

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 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.
  • 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://ggtraff.ru/123?keyword=present+simple+versus+continuous+exercises+pdf In PDF document text
    • https://site-1038421.mozfiles.com/files/1038421/39059297905.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/33362774749.pdfIn PDF document text
    • https://site-1038629.mozfiles.com/files/1038629/43212155627.pdfIn PDF document text
    • https://site-1037866.mozfiles.com/files/1037866/31230531350.pdfIn PDF document text
    • https://site-1040767.mozfiles.com/files/1040767/baxugozexim.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/zezofaxenuwixume.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/7733453.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/kegig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f87550743e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f870da3d44b8.pdfIn PDF document text
    • https://site-1039449.mozfiles.com/files/1039449/zuwopiwisovi.pdfIn PDF document text
    • https://site-1040132.mozfiles.com/files/1040132/28857109268.pdfIn PDF document text
    • https://site-1043328.mozfiles.com/files/1043328/dubuvosuzuzovilisomosik.pdfIn PDF document text
    • https://site-1040670.mozfiles.com/files/1040670/kinoj.pdfIn PDF document text
    • https://site-1040032.mozfiles.com/files/1040032/pinoxutobolavumokewefe.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/f4ddf70d-3b11-4857-80a8-c99eecda5135/94030512410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2359b3a9-93ef-4726-bbcb-bb6c03c66b8b/32956721459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c37eb2-b80b-4406-9a21-73ab4f162eb4/jonotum.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_off0000769a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x769A 5220 bytes
SHA-256: 364b1a95ba16ce5c01653ba1ba0e2ebcc9fc7d2d13e745212db5eee31d9243c0
font_01_sfnt_off00008849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8849 10336 bytes
SHA-256: b4ffa2fc9bba13bcf9ae6eead466054ebc7ce016551393f1c48bb94cfeaca438

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