Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7848bfbec1af8f…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 14:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04a51d7bada2c8f122f5c7d61dc2ad0c SHA-1: a132f921d4d5adc465cc29b83606309ba60ff4dd SHA-256: ec7848bfbec1af8fad84c9422330a17badbb291e54ec103d741e9f880985d913
186 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 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 0.9225

Heuristics 6

  • 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 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://zajinet.ru/award?keyword=window+type+air+conditioning+system+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393041/normal_60544f6fe08be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6009e11f5760a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_602e0978b0a68.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/enuresis_nocturna_en_adolescentes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fc6ae6d473fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_60242884f231b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_6027437aab68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6023e63a4d836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6041ad43da066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_603a0e44e3860.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/janirolajesifiwalaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_60d274b7e7ba478d8424095686ab9716.pdf?index=trueIn PDF document text
    • http://lesizuli.epizy.com/hybridization_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc7c868-5a91-48a7-b5dd-f8619ce86633/90377643943.pdfIn PDF document text
    • http://dumevurofif.rf.gd/apple_id_account_information.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/poulan_p3314_carburetor_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd9e63c-32ec-46b6-99ed-2de41d2b3eb7/black_and_decker_drill_bit_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724badb5-f301-490a-a7ce-2f471ab3048c/tajenaxifovazavekawirosas.pdfIn PDF document text
    • http://renozupopobija.epizy.com/37743223817.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/ge_spacemaker_over_the_range_microwave_removal.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_1fc895cb4d5d4082864ca11e685a1d79.pdf?index=trueIn PDF document text
    • http://sefogozi.epizy.com/ayatul_kursi_in_telugu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cb793d-a83d-4c83-8fe6-901b80ce45f9/can_you_breed_daphnia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b514bf99-9902-4d22-adff-de5dd511657e/b_blood_type_diet_recipes.pdfIn 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_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 5648 bytes
SHA-256: 722f8871b54e522fe399a60367f3a742381e2b93d06d4482ad5e2458d92bf4ed
font_01_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 10736 bytes
SHA-256: 3ed0ecf09a0ec1f4d2a9a71bc5059f0aae6f3edcc4e91ebc58802ec41a7ff7ec

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