Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fa3fae9d33ad3f…

MALICIOUS

PDF

71.3 KB Created: 2021-01-12 14:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 344d492937311e85d6ae152307a7b918 SHA-1: 8a98786007d06146caf42e90a42654f2aa687f34 SHA-256: 41fa3fae9d33ad3fdc022f3147d83d051e3d974ab6b1b6f90e6ebf3740ae5cf2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO abuse tactic. One of the embedded URIs, 'https://trafftec.ru/aws?utm_term=bholenath+new+remix+song', is presented as a song download, which is a common lure. While no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of malicious intent, likely to drive traffic to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=bholenath+new+remix+song PDF link annotation
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/lezomeredodizeze.pdfIn PDF document text
    • https://kisajevipog.weebly.com/uploads/1/3/2/8/132815123/6750484.pdfIn PDF document text
    • https://revunipaletofux.weebly.com/uploads/1/3/0/8/130874393/seveziwod.pdfIn PDF document text
    • https://site-1176005.mozfiles.com/files/1176005/fupejawuwi.pdfIn PDF document text
    • https://madapupe.weebly.com/uploads/1/3/4/6/134667506/986aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fe7cfaf378f9.pdfIn PDF document text
    • https://site-1172703.mozfiles.com/files/1172703/75680511559.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/4309292.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/lutofedumixapiv-kinumudolozi.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/jukoxisojow/30303358137.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/elapsed_time_half_hour_increments_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/salary_arrear_format_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/securecrt_windows_10.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 5308 bytes
SHA-256: e44f94335789a212096b02e8ed90881be28352068b0d755606c02a42fa82a29c
font_01_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 10976 bytes
SHA-256: cd645ad1ba2dfed3e434f85bd3fd4961b6f779aae69a92405f9c3b2e30ce65d5