Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb87f56faeea4860…

MALICIOUS

PDF

78.9 KB Created: 2021-05-30 05:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 09075e4147b4fae051d4ad654d5b2c64 SHA-1: 738726e95611525fed4e56f9476a4ec7be440b2d SHA-256: cb87f56faeea486080aa702cf823b6b61f3f9117b2c6bcd6ba53bbc9b6124204
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vmware+player+free+download+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414332/normal_600f9de8d8656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6061acf878263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_6026fbe3c8953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_6041d20765945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5ffb7e4661496.pdfIn PDF document text
    • https://vexivager.weebly.com/uploads/1/3/4/6/134634122/dizomodibawuriwovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_600839edb5488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_601070ee9c65f.pdfIn PDF document text
    • https://visuripaxu.weebly.com/uploads/1/3/4/7/134711721/vemotojatuvisafile.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/8c11de3a-fcb8-4a04-bb34-0a2378b4f0f8/which_rental_carpet_cleaner_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1060d945-28fc-4524-994d-e55aea000a81/91811802851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a33a0fc-fce6-4293-aecf-308f3a768007/pass_compos_imparfait_plus_que_parfait_exercices_corrigs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d006e66-c528-4a05-9a9f-40453ad122e0/integrated_math_1_volume_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f117180-9753-40d7-b64f-2bc9fc38bb85/selection_kiera_cass_film_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ef8457-5792-494e-8236-26ead3857a36/terujopeneneketopakafesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23bfad7f-1703-4157-a3d2-da24a898af74/muvurimabemunedeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad629ba1-33fe-4cb5-8b6e-62e9cfa04c32/what_is_the_cyber_threat_intelligence_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc05a863-764d-4a24-a65e-d6e0ae0bb80d/83517667930.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_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 5604 bytes
SHA-256: a697f2e6f78677fd64507a8484555b1f7c9d0f94122b171abdfefba7b1e6d436
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 12900 bytes
SHA-256: 48ccd309f524263b5e1a924df83923ff9914ba23a0537769b90d8926e31ecedc

Open this report in the interactive analyzer, or submit your own file for analysis.