Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ee10e8fb2a3495…

MALICIOUS

PDF

84.9 KB Created: 2021-03-24 19:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b8fa1ba81b4e790a591c474a48e75026 SHA-1: 572c8e796db71728d2daad215ca3b11b76716d14 SHA-256: f5ee10e8fb2a3495444152ab2fef5b0c6e0f0fb752ced799b00024c07df1c07d
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 0.9992

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=animal+development+gastrulation+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477164/normal_60503b61af14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_603bd823696f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_60158c9b8b06e.pdfIn PDF document text
    • http://ziviludemedo.iblogger.org/black_and_red_wallpaper_for_mobile.pdfIn PDF document text
    • http://dobafeser.66ghz.com/pimaxabefutebutelamarutuv.pdfIn PDF document text
    • http://saluzoz.iblogger.org/discovering_geometry_chapter_4_test_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_6044257c6779a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5ff80e051cb3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_fdf83737051d443ca330f78d56739305.pdf?index=trueIn PDF document text
    • http://davidajepini.epizy.com/40447498152.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/jakowufepot.pdfIn PDF document text
    • http://pifutujotot.epizy.com/brentuning_vs_maperformance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9004bac-67ea-4e93-852f-1170f05dfbfc/how_to_draw_a_human_body_for_beginners.pdfIn PDF document text
    • http://nazedizabif.rf.gd/botalefakamiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285884ff-df94-45d6-941d-b6dc14e0bf83/2118336658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26adcb05-98ca-4e18-9e53-e82c1cb56864/nikon_d5200_price_best_buy.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_fcff7cdf221c42a4a69c2aea0c1f57b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f4e656-fba5-4786-be0e-c2676b86858b/binomial_theorem_definition_math_example.pdfIn PDF document text
    • http://zogivumomu.epizy.com/31662169734.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/9662072583.pdfIn PDF document text
    • http://vesazunexupeva.epizy.com/how_much_does_it_cost_to_get_a_dna_test_for_your_dog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf30b94-133c-43b7-9c65-d8f2f81e72cd/legupegod.pdfIn PDF document text
    • https://7920a853-f458-4dfc-a893-f50c3ed6f780.filesusr.com/ugd/fe7850_9be320d54cb249d7b49281332dfa2bc1.pdf?index=trueIn 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_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 5580 bytes
SHA-256: a4301254126288ae73ca83055939c397b08de9187e8a34263610d56b132b9d80
font_01_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 10580 bytes
SHA-256: bdb2b804b7929713347eab2fa5b905357c6721b421a03a7b25de58eb91bd4e94

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