Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0877d530f2e294…

MALICIOUS

PDF

80.1 KB Created: 2021-04-01 10:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d3286991660c7fd6a3b78b3e7f2ed163 SHA-1: 53637817f3bbdf313306603b1dccc1ba0bb9c9bc SHA-256: 0a0877d530f2e2942e4bcb94f23421739b9475818b9b3150709a7afd513ef5ea
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, indicates it is disguised as a research paper. The presence of external URIs and the link farm heuristic strongly suggest the primary purpose is to redirect users to potentially malicious or unwanted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=alcance+de+un+proyecto+de+investigacion+pdf PDF link annotation
    • https://bedusetifimanov.weebly.com/uploads/1/3/4/8/134846759/413197.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/punirosizateta-buzirepozoxigen-rapajepelamepek-vanexarozanajo.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/xuidiia/dent_de_lait_qui_ne_tombe_pas_chien.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/gpIgilL/56938870660.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/yifjdje/brandi_fenton_splash_pad_tucson_az.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/ganil.pdfIn PDF document text
    • http://mejuzuw.scienceontheweb.net/87266159332.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • http://jozoxumugeg.iblogger.org/mudufuzif.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/4jjiihe/the_cheetah_girls.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/xasakuj.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/emqUlGl/car_race_track_for_toddlers.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/how_to_repair_an_igloo_portable_ice_maker.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/65982190754.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/ehfWhiY/51833141660.pdfIn PDF document text
    • https://cdn.sqhk.co/vugujebeku/ieotBNv/duraparidubobonag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitikepaz.epizy.com/46068047966.pdfIn PDF document text
    • http://bijamujijupife.epizy.com/42535847297.pdfIn PDF document text
    • http://dejugatifug.rf.gd/misterio_belicena_villca.pdfIn PDF document text
    • http://tuvajitivozozek.rf.gd/algebra_of_sets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07968d4c-d24c-45cd-8587-3e4ab16dc3a3/what_is_another_word_for_captive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cef795-ed6d-4238-a7fb-7cd24afb456f/38183076275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d10192-ea16-4188-8c00-b8ce2202b532/1074596942.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_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 5472 bytes
SHA-256: 56d0b60633c11ef96ee550f08dd7a35cbcf93d64e6054e5b8abe0241c01688c3
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 12008 bytes
SHA-256: cb5ad47cacf0bccc505df7a57d4ba4e592546d45cbc4c279eb0e6c78f2e70d7f