Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce67751875478f5…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 00:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c96e1602fc8d6714aa0c9d94d056e0f4 SHA-1: 7d4411f974f7bdc6856c79d1d8b374eabb9c3f09 SHA-256: 4ce67751875478f50045241b9c2779494c8772198c36c62ae12cf6a6a0767e01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URIs suggests an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=cookie+clicker+github+code PDF link annotation
    • https://cdn.sqhk.co/xubipoxeguza/heKdcsz/fuputenaba.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/19582862930.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/dMigifa/mameborifonadonasuj.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/ijffhaO/40772251125.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/tuvemekomom.pdfIn PDF document text
    • http://xarubuxa.iblogger.org/57546515959.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/how_do_i_reset_my_kwikset_smartcode_909.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/25529181185.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/fhbihXz/docs_online_report_nsw.pdfIn PDF document text
    • https://cdn.sqhk.co/gerezowuves/b0UjhKg/62692282768.pdfIn PDF document text
    • https://cdn.sqhk.co/wupefukawis/djjijnz/angular_formcontrolname_nested_property.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/94646139562.pdfIn PDF document text
    • http://tuworiki.22web.org/bbc_food_guide_bubble_and_squeak.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/89907829894.pdfIn PDF document text
    • http://orteil.dasIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipetiwivi.atwebpages.com/58293967868.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_1b7ebd29232a4ae9b2cfd2d93bb23f38.pdf?index=trueIn PDF document text
    • http://zenadeguposu.rf.gd/abnormal_psychology_test_bank.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/ansys_classic_commands.pdfIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_0550a55d33a44327a420f946961d865a.pdf?index=trueIn PDF document text
    • http://muwalolerede.epizy.com/felesazig.pdfIn PDF document text
    • http://bimogudi.rf.gd/st_andrews_university_logo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 4920 bytes
SHA-256: 494345e5d5c4522fa32c9c3757a8b8c0128746f35e1a58edbd5d07ddc66d5ba8
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 11812 bytes
SHA-256: 8701f38eada7a0e7a0e7ee3393265c0e64527c30e03538a4b1cf96112e26923f
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16352 bytes
SHA-256: d5c1d73facc1ee30369663d5bc9e1d56b1b6bad2d1eb0652642bc5daa7bdf87b