Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bad3f1a53bc16c6…

MALICIOUS

PDF

73.1 KB Created: 2021-02-28 10:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7fa85ecb2e110929e8e7cae4e6f34691 SHA-1: 5c9daac1a7cd89f9892a6ffcffdbed17c250db27 SHA-256: 4bad3f1a53bc16c69a62610bab338be1f782aa0dd2214adf930c33fdfb17d573
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=the+road+book+ending PDF link annotation
    • http://reduslimitalia-official.site/difference_between_wavelet_transform_and_fourier_transformzzrt0.pdfIn PDF document text
    • http://lidedapomegila.iblogger.org/48275758115.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/46948336203.pdfIn PDF document text
    • http://iuts.space/what_can_i_do_if_my_washing_machine_wont_spincco3v.pdfIn PDF document text
    • http://ledy66.net/master_forge_charcoal_grill_ash_pan_replacementlz1u5.pdfIn PDF document text
    • http://pannochki-art.com/jewekotanoxifopave06wx1.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/atJ5YnE/classcraft_student_code_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://torogita.rf.gd/49197726457.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/88848032239.pdfIn PDF document text
    • http://baruluzibovog.epizy.com/breeam_2011_new_construction_manual.pdfIn PDF document text
    • http://konogorubur.epizy.com/54937992722.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/72114645282.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/4800332318.pdfIn PDF document text
    • http://fevepapowiwed.epizy.com/62528266107.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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 5028 bytes
SHA-256: fea1d3f12566b536fd0a544e0a5805e7a53b26872f5ac6537c6e161492fa186d
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10276 bytes
SHA-256: b8dc3f87b8607e692b1d8c7fe28f484f0ab3fcf16ec941c311795734cd6a219e

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