Malicious PDF — malware analysis report

Static analysis result for SHA-256 2053b00f0cb5136e…

MALICIOUS

PDF

131.9 KB Created: 2021-03-31 05:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8fecd59d14f2105cd1a0425ead8fc308 SHA-1: d3f8fb7e99e009861898bc7d1a39928f1ccd84a2 SHA-256: 2053b00f0cb5136e8f7c8b2053a7e32d917526b60cd5076afd4a552e815c98a1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The embedded URL 'https://druttle.ru/award?keyword=toefl+vocabulary+test+pdf' suggests a lure to a potentially malicious or SEO-manipulated site. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://druttle.ru/award?keyword=toefl+vocabulary+test+pdf PDF link annotation
    • https://cdn.sqhk.co/posogamumut/Vgojchg/strategic_marketing_plan_template_doc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5fd08c454a795.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/PjihfXU/sense_flip_clock_weather_pro_apk_full.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_60542f1060d81.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/jgezRcV/nerupixalaku.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/ii7xjcD/toca_kitchen_1.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/jHHhaXG/58434473169.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/8c28f554-b946-472b-addc-ceabc1586d42/how_to_wire_a_usb_port_for_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abe79d7-3c86-4266-b04d-7cac043e8213/calligraphy_exercise_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f6c9e5-ba0d-4ab3-9317-43a5331f85f9/steps_to_personal_revival_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f34902d-0f9f-4f70-a727-37c7b682e516/what_is_the_depth_of_a_sub_zero_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0854b8cf-c5c8-4cb5-b63b-68b1b622d23d/citizen_eco_drive_wr100_gn-4w-s_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cbc987-7516-47cc-a24b-a4b95c9d722f/acorde_de_bm_en_piano.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_4d7749efe70949129c1a46c2da23ec22.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_752e2a307c3e4648a3acb88465ed87f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd47c2d7-f36d-4b39-bc2f-0e0e2eed5f6d/how_to_assemble_a_kel_tec_p32.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c1fd01-4588-4ce6-8f23-33fa7a226d07/the_mixing_engineers_handbook.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_off0001cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC37 5400 bytes
SHA-256: bfc27df4121e19d0a6804eff9f1296b57e532d3848d735b575d2d90e09794f36
font_01_sfnt_off0001deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEB1 10480 bytes
SHA-256: b95a39d9cb237c5504c37d135b453d557731fb45d9b44a778281985e46c9778b

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