Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3b6e054c86062c…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 15:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e857846ea3b717d9cd0c75ad68215d89 SHA-1: 65a12633f94e843a577590f4484e83b1e0cc8456 SHA-256: ef3b6e054c86062c98318b961a106febd75be6cb361d7405bbebe06bee8f360f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, https://mezovuduw.ru/wix?keyword=plt+3d+python, is flagged as unknown reputation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://mezovuduw.ru/wix?keyword=plt+3d+python PDF link annotation
    • https://cdn.sqhk.co/retesixabe/hjiibWV/6013364414.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/cMhggdg/nadodopepenogexomiru.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/analog_and_digital_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/cjaJmgh/60964860593.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/gfPgghd/best_free_litecoin_mining_sites.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/wjhhaae/tixereruvibokezime.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/Chfbtdc/international_business_management_salary_uk.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/doxerozusuwaduli.pdfIn PDF document text
    • https://cdn.sqhk.co/rojotuwo/CjiwOib/bahubali_2_movie_video_song_hd.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/e4639953-0471-4bb2-9ce1-b8dc55fd1bab/best_glute_activation_bands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab7b28c-98ca-4055-a16d-7dd23b6f7dff/what_are_the_four_basic_needs_of_all_living_things.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_5229d61668f3435ab6785eada9878ed5.pdf?index=trueIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_93e94d043ce84163a605dad58520090c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6058fc-af3c-485b-8720-572eded14b4c/musemanezasumivisobuzom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031ec3ab-546c-4420-ad12-fee78724514d/periodic_table_of_elements_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8141cf-da3c-4b49-a388-e1b7ceb2c4bf/what_does_company_culture_mean_to_you_interview_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4fb136-4215-43c0-9065-41c8b3510ae9/watch_smartest_guys_in_the_room_free.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_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 4832 bytes
SHA-256: bd63000e5c0103a3f3f1a765167b6f938ce7c37f5c7961f1686b14b35fc0815d
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 10664 bytes
SHA-256: db799e3fd97d081b374b5c53ccdb949c179b14210d975320f26ae052ed821a4f

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