Malicious PDF — malware analysis report

Static analysis result for SHA-256 341b02f4a6864a09…

MALICIOUS

PDF

68.4 KB Created: 2020-11-11 22:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 71fbe353c77c8588153428620169ac34 SHA-1: dfe5823c93a6763776483dcab0ec74877d336b1a SHA-256: 341b02f4a6864a098ba9662b6e77b3bb416c89bb30bf06f2ce905ef39f9c46a0
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 0.9998

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://trafffi.ru/123?utm_term=katy+isd+pay+scale+as04 PDF link annotation
    • https://raxisova.weebly.com/uploads/1/3/4/4/134494277/mumopimagizekonuzis.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/09827c07382e8d.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/mujabuxorajijiv.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/017befd.pdfIn PDF document text
    • https://xegubivagemegi.weebly.com/uploads/1/3/4/4/134481439/22490.pdfIn PDF document text
    • https://minupinuluvuziv.weebly.com/uploads/1/3/4/6/134608869/rulutabuwemijebutufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fazujo/67428969028.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/web_page_converter_google_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/tutinarugigezejokafefe.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/icj_advisory_opinion_kosovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a4b1de-330e-44c1-85c2-bd936f257412/9574286663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908df871-c9fb-40d6-8490-50c42417fd67/amending_the_constitution_notetaking.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_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 5272 bytes
SHA-256: 817d5be317b60153786a287b8f47358b68c10ec8850d2b18ccb77dc81db84cde
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 10780 bytes
SHA-256: 327e0822ed706de1162d573bf987569eaed9997b496ee4116eee25e528ca8962