Malicious PDF — malware analysis report

Static analysis result for SHA-256 1435031ef5f40fa4…

MALICIOUS

PDF

37.3 KB Created: 2020-11-09 14:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2a3aed264fe34b2f41014b2b02d8dcf1 SHA-1: db2162f643f26f61b8d13558514fd21d92986b8c SHA-256: 1435031ef5f40fa48ca406788a63cd3bc0a8605e5705d7fbe22089cadd7e4847
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

Heuristics 4

  • 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://trafftec.ru/strik?keyword=genetics+word+search+answer+key PDF link annotation
    • https://puniduvete.weebly.com/uploads/1/3/4/3/134341297/9022386.pdfIn PDF document text
    • https://pamuvomamutafa.weebly.com/uploads/1/3/4/3/134305197/1015146.pdfIn PDF document text
    • https://xowilululevala.weebly.com/uploads/1/3/4/0/134017879/6708299.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/57666.pdfIn PDF document text
    • https://pawuxadatunu.weebly.com/uploads/1/3/4/2/134266652/kulolomin_tizozalexagixak_dubonobuza_pozojamuzavejax.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/eda9d0b.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/baxunaf/kaxabazimiripowumij.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/jakaxubabetenava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e4d736-c305-4ba0-aab3-3aa771053663/multiplication_rule_of_probability_matching_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/usb_cdc_class_specification.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/losidafonurikilug.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/91550653582.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/45490422159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640a3827-0390-4ea0-b92e-94cbd2631aa4/62903085263.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_off00005470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5470 5284 bytes
SHA-256: efa14daae8c420752064856f1ecbd8852bae5a215a513a5f9ab66fd2e1453eae
font_01_sfnt_off0000667b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667B 10124 bytes
SHA-256: 34df92ab2f364a9daff882b012fed63a8fe3d1dd4ecddfe4bc6fbc2e8f444a73