Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb65918ea876444b…

MALICIOUS

PDF

81.8 KB Created: 2021-03-26 09:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cecd91cfc8357a634b2bf7ffa9cad6ea SHA-1: 57fe978e34ced3d8d7122fea595bd368ae230bb9 SHA-256: cb65918ea876444bd8d0ebd2851e397205c9a70765c721c9777ffc9ce75841c1
156 Risk Score

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 0.9996

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://zajinet.ru/123?utm_term=coreldraw+brochure+design+templates+free PDF link annotation
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/9905700.pdfIn PDF document text
    • https://poteboxamakimef.weebly.com/uploads/1/3/4/3/134325651/kinerinonagodoraz.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/vufojarupirijepojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rujimidujek/scert_assam_full_form.pdfIn PDF document text
    • https://d2497fa9-5496-4194-9764-f4b168485e88.filesusr.com/ugd/eed259_c1c618d7cea04e2c918c9bf922b7cd3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/9822305701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbbcba1-9338-43f2-8c8a-c870c0829efd/80251956537.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/kala_bazar_1960_full_movie_hd.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_e0aa539620034e4c9208b76b597f3c90.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_a5c42d4979364b958610be8be5fe15c9.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_f05795686d55415ebc0d4ca07148a454.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbab0a9f-ca49-45a5-baf8-efce6fa79b25/24765350802.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/zixagoxog.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_e548df17bb2a4a6e9c1e030a2c6b9841.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/charles_shirley_jackson_short_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f9efbd-1060-4944-99ae-d16f9dce8516/vezovesudujulujuworur.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/16776856061.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/oedipus_rex_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfaa9d12-413e-4bcb-89c7-00ecbcebe4ac/what_the_scout_oath_means.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2858bb-da23-448a-bc1b-166c325f86b7/xegudapepamanobodu.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/how_to_link_microsoft_bluetooth_keyboard.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 5708 bytes
SHA-256: 4cde3dd3233ddaaf4580617db9842f5a4fb5b3cafca1e1a3743206da3cc264a9
font_01_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 10792 bytes
SHA-256: 7cfd72ae178bbf3eec5c06b010f628a492e2b502e73782d05205cafe1f1390cd
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2