Malicious PDF — malware analysis report

Static analysis result for SHA-256 635d43fb10f1ef90…

MALICIOUS

PDF

74.8 KB Created: 2021-01-18 22:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d4d0881bc1bf267aadfc7567aa0b4175 SHA-1: d9720f67ea965efb6687898c2b80a33e8d123790 SHA-256: 635d43fb10f1ef9057ff4c59859c49da7b94cfd20dadbca264eb7fb1eb1c727b
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://cctraff.ru/123?utm_term=etapas+de+desarrollo+de+un+equipo+de+alto+desempe%25C3%25B1o In PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/5761154.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/dgjxqAn/water_parks_in_tampa_fl_area.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/iggihjr/duloxisonupu.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/y5Zbijq/vijurororuwexeb.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/hgjdjby/world_cricket_championship_2_wcc2_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/biijiif/47259044675.pdfIn PDF document text
    • https://patoxudiza.weebly.com/uploads/1/3/0/7/130739147/fedopurojuw.pdfIn PDF document text
    • https://jesugenug.weebly.com/uploads/1/3/1/4/131406432/4925534.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/vutatol.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/ifLjjgi/lolig.pdfIn PDF document text
    • https://bigarafomamuwi.weebly.com/uploads/1/3/4/3/134318607/segef.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/2nhbhjr/gosataxiperusorexavog.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/1114a23ff.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/6467805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewoxorewozox.rf.gd/get_sheet_by_name_google_script.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/fudovatodapunekubopixo.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/ms_office_2013_activation_key_free.pdfIn PDF document text
    • http://mubadel.epizy.com/alarm_clock_android_10.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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5400 bytes
SHA-256: bc77f8dbe03c026cad79091f0f0796755f14f912e7a69a8c9a7874def7843b8e
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 11392 bytes
SHA-256: 1a876472e2bdf1eeb348ef8db948dd823bd63cbbce2b00d67e0c54a2831af823

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