Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8ee24d9e9697c9…

MALICIOUS

PDF

77.1 KB Created: 2020-11-07 09:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d17a9089cbe905b8087e5dfc5ddd6dc1 SHA-1: 29a8eecbac820e3b0f62ce3a0bfacee758563241 SHA-256: 7f8ee24d9e9697c99b5177cd388d3146df2dd91f865afd48e1d0e8f3c2cd9b2c
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://trafficel.ru/123?keyword=kyocera+hydro+air+c6745+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f8cf01109d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fa396fcd33e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5fa12ffec05bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5f9fa99481f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8afab74d74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_5fa57ad161d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5f999907cdd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_5f9b2a1f650c5.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/henghuili-files/mutetevazepumodujawuk.pdfIn PDF document text
    • https://nijubar.files.wordpress.com/2020/11/75846096254.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/nowofenob.pdfIn PDF document text
    • https://devirum.files.wordpress.com/2020/11/kyoto_tourist_map_english.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 5520 bytes
SHA-256: 3b88def121f741bd769b6c76449dcea79bff4adb38e327be2a5baf4f5bbf3c89
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 11148 bytes
SHA-256: 220e88e9bb2eeff2a67bd6e550148c129dc44de784fd4d37049f7ca8df57a900
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16076 bytes
SHA-256: 050cca2678d7435c270027ff58d84efa212ea3c5592871ae9bdc0d1e185112d0