Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f280cbab69ccc1…

MALICIOUS

PDF

73.8 KB Created: 2021-03-02 17:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6cd1cd02d4d09f7c6fc342171095cc3a SHA-1: d299ba6738bab61efdea86a6f489cdda3b5d6b45 SHA-256: 40f280cbab69ccc156e000eeea8c8eb2a4d852a5857e6322cfae712aef69d96c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=are+all+crib+mattresses+standard+size PDF link annotation
    • https://cdn.sqhk.co/lididiregi/jehdhfo/sipibebisowesexovolowanuk.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/41939581005.pdfIn PDF document text
    • http://boomua.site/skylanders_imaginators_starter_pack_xboxtqd9t.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/jvjfgcl/dilanavana.pdfIn PDF document text
    • http://bt-management.website/what_is_the_most_rare_genetic_disorderuqw0f.pdfIn PDF document text
    • http://bristol-yalta.run/the_hiding_place_movie_online_freewubkg.pdfIn PDF document text
    • http://srakan.space/can_god_give_u_moneyl5css.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/classworks_login_marion_county_alabama8fv20.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/6egfbia/96964405196.pdfIn PDF document text
    • http://topcreditcheck.info/54724956297ka2b0.pdfIn PDF document text
    • http://canonsburglake.org/contabilidad_de_costos_boliviajcb54.pdfIn PDF document text
    • http://silver35.ru/31086549054spqvm.pdfIn PDF document text
    • http://fabermanufacture.ru/1901685100035luw.pdfIn PDF document text
    • https://cdn.sqhk.co/dusawugivepo/jzhd0Ls/plinkogo_lucky_and_big_winners.pdfIn PDF document text
    • http://italywow.space/39628099861dregx.pdfIn PDF document text
    • http://samozanyat.info/297410600307gbhe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibobega.epizy.com/asge_guidelines_gallstone_pancreatitis.pdfIn PDF document text
    • http://resaruxowepu.epizy.com/checksum._ini_file.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_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 5264 bytes
SHA-256: adeeafe1eb4df9d9e6ff94382b5065528b4096edd80fda4c51eb39552402a503
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 10460 bytes
SHA-256: 9091a936c6705e29c94744a655d19154e2179b5f2aa60a2ca37d5a2948cec783

Open this report in the interactive analyzer, or submit your own file for analysis.