Malicious PDF — malware analysis report

Static analysis result for SHA-256 613a4d0711f32c83…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 18:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 48eb5af131997b25b34351ffec147d93 SHA-1: c04975a70023b67984652b27a18fb3571d4273b2 SHA-256: 613a4d0711f32c8327f3c4a54695a7435910acd1a89baa991e8fe1854af1adcd
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it functions as a link farm, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=8+month+mewing+transformation PDF link annotation
    • https://cdn.sqhk.co/tigugobe/himieqm/apple_catalina_slow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ff9d327a5212.pdfIn PDF document text
    • https://cdn.sqhk.co/balemarize/jeidgh5/49787858360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_601d7ec36b6e3.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/lorovetowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481994/normal_5ff76af6206c0.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/converting_kindle_books_to_mac.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/how_to_install_sunbeam_heated_mattress_pad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ff2b9e3053dd.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/data_addressing_modes.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/is_season_4_of_tokyo_ghoul_on_hulu.pdfIn PDF document text
    • http://momarivido.mypressonline.com/56812107512.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/business_development_skills.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivuvupaxiju.rf.gd/strife_specibus_template.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/assessable_spouse_election_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148e28fe-cbb5-4f34-9652-6e9d3447d954/42886761924.pdfIn PDF document text
    • http://bazolajeruda.rf.gd/ncis_new_orleans_the_river_styx_part_ii_cast.pdfIn PDF document text
    • http://lozisuvuxinosog.epizy.com/controls_and_variables_nemo_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a47f9bb-8391-4d26-8960-6b449df4debf/harry_potter_6_movie_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8792ce9-b5e5-441d-98a7-6114b725c4e1/82399773223.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_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 5340 bytes
SHA-256: 0c683506a3bc20c34879c17ab47841b4a4d4d5bb0e53f2717447c3c81a6031f3
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 11328 bytes
SHA-256: ad62c2f09be6738472c109b7a051dd0c43d6b3b63255df2e4d4d0d0744c6ca17

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