Malicious PDF — malware analysis report

Static analysis result for SHA-256 266f8a4175ff9845…

MALICIOUS

PDF

95.9 KB Created: 2021-03-23 16:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e190b02c5d8fdc28b4a82135440fda90 SHA-1: 521ff28725edf19811d9d920f6dc36526e58810e SHA-256: 266f8a4175ff98456e0d61c527e48b9fa32ca4c3d45a3b642ae9c115dbaa3db5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://druttle.ru/award?keyword=caida+libre+y+lanzamiento+vertical+pdf PDF link annotation
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/438301e43bfce5.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/polite_words_worksheets_for_grade_2.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/Pcriiha/mulufeme.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/test_your_business_english.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/ij0hagc/nelab.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/hp_photosmart_d110_printer_wont_print.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60300a53de2ff.pdfIn PDF document text
    • https://rolugoxeve.weebly.com/uploads/1/3/1/3/131380951/rurijufe_vimej_gofabuvorumuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_603668375c361.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/68823022197.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/aiaihia/example_lesson_plan_in_free_fall.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/hjiiagj/14153087897.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/24689532026.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/junuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxolavomuzo.myartsonline.com/mezawaru.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/pumumodikanemifikikop.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/52208714612.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/best_vhs_to_dvd_converter_software.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 5380 bytes
SHA-256: 7b1d09a188f9eb49af3ba398429c58d03f18f81a3fdf356cf38c5300aafa2646
font_01_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 14032 bytes
SHA-256: 0b8af6e56c0b2b7681a150a692d51405a220d3cefb80508af86f67537ed11f5e
font_02_sfnt_off00015b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B16 16212 bytes
SHA-256: 519304cec8c5e48959360a322b5c3e500bb3dbc5e80471dcd168d02d78b82f86

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