Malicious PDF — malware analysis report

Static analysis result for SHA-256 865454e36c28373d…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 17:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6eec8ddf0e53963259edb16f021daf7e SHA-1: 73c53afeead67b20e7835bff0cb3625726d7f702 SHA-256: 865454e36c28373d4d5ac2ad593b2d5b777d4681c18110b2f54cd21faf7b2a51
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external 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://pelibifir.ru/123?utm_term=chenderit+sixth+form+prospectus PDF link annotation
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/fazomimuvapewa.pdfIn PDF document text
    • http://onlyforyou.space/texas_instruments_ti_89_comvfmc5.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/bXhjovB/ropep.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/gdQjeuE/83880159255.pdfIn PDF document text
    • http://nyvelsets.online/formal_definition_of_absorbancenb9ad.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/ghiQmSG/28044900643.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/o0HBhjl/24337910720.pdfIn PDF document text
    • http://lady-bug.club/dudosazefijusodudaremudo0oqwa.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/jhA4jhR/switch_controller_on_pc_fortnite.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/6060352.pdfIn PDF document text
    • http://sdfafq.info/naruto_shippuden_episode_guide_no_fillers5ceo7.pdfIn PDF document text
    • http://whitecheat.xyz/ravuw6zj5z.pdfIn PDF document text
    • http://nanutoz.22web.org/322176798.pdfIn PDF document text
    • http://magnitoli-2ekran.site/maths_textbook_8th_standard1tkmh.pdfIn PDF document text
    • http://superheatbelt.xyz/how_to_make_cream_of_tartar_for_playdoughi1e4a.pdfIn PDF document text
    • http://storeyou.store/how_to_study_degree_onlinej45h3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudebesiku.epizy.com/addons_wow_classic_guide.pdfIn PDF document text
    • http://najorenowodume.epizy.com/citroen_c4_picasso_2014_manual.pdfIn PDF document text
    • http://boripodadup.epizy.com/adding_and_subtracting_integers_lesson_plan.pdfIn PDF document text
    • http://bubalafugevale.rf.gd/24525438856.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5128 bytes
SHA-256: 2aad91e303da28786850c7920d4752c355d2dfb2d5fa8b6433a5f9292a808ac9
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 11628 bytes
SHA-256: 74d6c471ed220e00b6e7cef12e27d264ae751d6b3222a895d8fa08512d3f76f8

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