Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe88fe9cfa73ed63…

MALICIOUS

PDF

75.9 KB Created: 2021-03-21 02:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 690835b976bde2ec77d54c463c7c01b2 SHA-1: c886406224a146d2588f5a62c19b98de45de548a SHA-256: fe88fe9cfa73ed63b9d59c4bd5ff4060af9e9bcfd24c776f03056cf3c16928ab
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=steinhausen+watch+winder+owners+manual PDF link annotation
    • https://cdn.sqhk.co/dukosisevu/jWgibjj/75855363892.pdfIn PDF document text
    • https://kizofirelurok.weebly.com/uploads/1/3/1/6/131606598/tisamutew.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/3808836.pdfIn PDF document text
    • https://telogedibosujo.weebly.com/uploads/1/3/1/4/131438044/1861973.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/gulozuw.pdfIn PDF document text
    • https://regasefes.weebly.com/uploads/1/3/1/8/131871592/tulixaxirewatej-gafatamiwi-wuduvomaxeziv-vekupakamugo.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/haiTgjl/gallery_wall_layout_calculator.pdfIn PDF document text
    • http://copyright-helps-team.com/bangla_golper_boi_free_downloadrs1a5.pdfIn PDF document text
    • https://zosolino.weebly.com/uploads/1/3/4/6/134676828/jadudod.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvazilu/cgjbAjg/724547537.pdfIn PDF document text
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/569111592bc19.pdfIn PDF document text
    • https://fosuxisemobiv.weebly.com/uploads/1/3/4/0/134000083/8986559.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/gsheghQ/u_miami_law_academic_calendar.pdfIn PDF document text
    • http://idealica-tufficiale.website/sample_invitation_letter_for_seminarxvjxi.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/PnijL1T/sezijuwuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1be95d-3de0-46f5-aeba-46124264849b/danby_window_air_conditioner_filter_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b94d721-6dae-4a64-8261-c9a4a462e9dd/64229845733.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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5372 bytes
SHA-256: 54387f033da939696d2052d2e1b56200dd5084b3ffb00d76459a1ef394955718
font_01_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 10684 bytes
SHA-256: 3899a4fc37c5b67435f38dc0691cfa8aef8d298839f117e72a9a244a7200ea1f