Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff95f2697a48d209…

MALICIOUS

PDF

79.5 KB Created: 2021-03-03 21:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 157ee42d4bf54dadf5d1d283c2ecd7c3 SHA-1: 5bf1d578f188e1ad2ce6e75a82cc02b321fd5fcf SHA-256: ff95f2697a48d209a3920465054f8723a7519bb61246e5460b1e20267b19c8cf
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://crophysi.ru/123?utm_term=how+to+lose+belly+fat+males PDF link annotation
    • https://cdn.sqhk.co/joxesinejag/chjngda/24258978337.pdfIn PDF document text
    • http://qupieasy.online/31755148719ta92v.pdfIn PDF document text
    • http://inscarusa.info/oppa_gangnam_style_hd_video_song_download2wgm1.pdfIn PDF document text
    • http://alexsaf.ru/cooks_essentials_electric_pressure_cooker_replacement_partsr30y6.pdfIn PDF document text
    • http://mybiol.site/44311921703lr4vy.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/25738789615.pdfIn PDF document text
    • http://purpless.vip/27429059959geycr.pdfIn PDF document text
    • http://kisegojunu.22web.org/gunuduzozewebubumesufusi.pdfIn PDF document text
    • http://nicepics.xyz/65650140093e5eiy.pdfIn PDF document text
    • http://copyrighytsupport.com/yield_curve_recessioneh4r8.pdfIn PDF document text
    • http://misstourist.info/gimenajejebuferirivtvs.pdfIn PDF document text
    • http://lnstagramsupportlives.com/cch_lu_hnh_trn_pixalooptvcwq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reduxaxu.epizy.com/40169833130.pdfIn PDF document text
    • http://budavazej.epizy.com/decimal_word_problems_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/definition_of_forming_adjectives_and_nouns.pdfIn PDF document text
    • http://gaxodusipif.epizy.com/fake_apple_receipt_email.pdfIn PDF document text
    • http://notumaxesi.epizy.com/gravity_against_the_current_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/manual_camera_procam_apk.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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 5112 bytes
SHA-256: bf365ce31085dfaaf54f583932cd1c5635cd9952c2e5cb3fdd727748d85df5dc
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 11280 bytes
SHA-256: 2da043fb3059a0dd502d7ef10ae9b7fbed03e7ca32258f1e1809c59b935c3784