Malicious PDF — malware analysis report

Static analysis result for SHA-256 75746041a98c5fda…

MALICIOUS

PDF

79.4 KB Created: 2021-03-20 03:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8740b5cd117fe23610d2b3402bcc4932 SHA-1: c4ecc2918f38cfab9ee257c94af8d151ef221a6c SHA-256: 75746041a98c5fdacc41fe48b1e518a3c2aa794aab496e28e8538e8963f5fc74
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary IOC is the redirector URL which is likely used to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/wix?keyword=common+noun+proper+noun+worksheet+grade+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469119/normal_602c0d44d16a5.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/33150576116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_600b8e7f36867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373516/normal_5ff797305fc55.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/emotional_intelligence_book_2.0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5fc7c9c79c977.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/9957055408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fe01b3d4df5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_605213b72636b.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/acids_bases_and_salts_tnpsc.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/1998_polaris_xplorer_400_4x4_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_60435a0151b9c.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/acidifiers_in_poultry.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/dilezazizazowufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fikuvine/metric_units_conversion_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/how_to_make_shadow_puppets_sesame_studios.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/xakuzuzixig.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_c14d88e9ce6542ea845cb46925952495.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/84506155691.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/nupuguwebizigudepuvuxa.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_cc9201ea94a74bf3b82d857f455087b5.pdf?index=trueIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/tejidozamupebitiwozov.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/what_to_do_when_your_keyboard_wont_type.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 5440 bytes
SHA-256: 8dc3fdb7bc62547d59f5d391357380fc390df90f70ed8452fcea4e84b54e0f7a
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10692 bytes
SHA-256: b8aa4d8109454c9791538c5184769f0cbe68569616462688ed54fd5e598cfc3c
font_02_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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