Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09e5c6451c2b8a5…

MALICIOUS

PDF

77.0 KB Created: 2021-05-22 05:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 61fca6d706008ff632ad85d7e1a142ae SHA-1: 571358643e98f1d25e06f0bcc8ef07eb06e4ca57 SHA-256: b09e5c6451c2b8a5fed024ac9770315b87e0dc0c51d19a2ffdb1a33c32cfa594
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9960

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://soxebez.ru/strik?utm_term=euro+truck+simulator+2+mobile+android+oyun+club+indir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385413/normal_602b0722064b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ffc75c0d168d.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/4419027.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/baxotovevufu_ferazurugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fcaf79c66987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fce9f18e6a02.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/vesowobuvurade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fd3dcd44860c.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/nosasojejunuf-danugusa.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/gasukabexuzi_mapokaxenolosaw_kasaxub.pdfIn PDF document text
    • https://jarupaxalimex.weebly.com/uploads/1/3/5/3/135324443/6f661e337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/savalaziwurexebepuzigafav.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/50307558142.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/28257560377.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/ardamax_keylogger_remover_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/salavo.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/xaxilefidej.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/bird_inhales_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/remove_background_image_from_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/how_to_use_the_garmin_gtn_750.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/reguwodenu.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/78761773947.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/where_can_i_purchase_a_jitterbug_flip_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/anatomy_and_physiology_lymphatic_system_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/manager_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/malelivodifefif.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_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 5480 bytes
SHA-256: 3ae68ceec0b27f43fa524196f30ca20a1e011774a550bb9031c6f71e669a3d47
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 10656 bytes
SHA-256: 5106e4254f5a49bba4f2d579cd61ea467c0edba481c5122727a29e50f75f8730

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