Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4c101237d83118…

MALICIOUS

PDF

43.0 KB Created: 2020-11-08 22:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 13d90385910ab2d9fa9f63c717326b72 SHA-1: b4a4f10b12e453877192b5958d4a807da3f0a18c SHA-256: 1f4c101237d8311879df7ceb2affb1561d78e580a62ab75201cab8f15464c378
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. One prominent URL, 'https://traffset.ru/123?keyword=trane+air+conditioning+manual+pdf', appears to be a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the PDF structure itself is indicative of a link farm or redirection scheme.

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://traffset.ru/123?keyword=trane+air+conditioning+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f9a61c379346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d798e931-07e0-44de-ac60-a2f23dbc542f/xewilamokunesofezupetexo.pdfIn PDF document text
    • https://widopimaro.files.wordpress.com/2020/11/zeguwuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/dd_5e_cloud_giant_smiling_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46e0fb3-1544-4fd8-9eca-fff072cf4ef0/kililuduramuvufapodinelen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f43404-bf16-41f0-b88d-a72ed04c634c/bimixomemaxid.pdfIn PDF document text
    • https://muzidageje.files.wordpress.com/2020/11/90015052176.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/palawo.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/jerukekukadosir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6047c7b-2cae-4040-befd-4cd80b3ab127/exercicios_de_quadrilateros_8_ano_resolvidos.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/nadejanarezobixuliser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2f855c-2afa-4ddf-8e5f-b823646a83d4/14999285826.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_off0000693b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693B 5244 bytes
SHA-256: ba3623277a9d585b51e0f187c5cc7b7854b3211f07ab778041736603e4eea551
font_01_sfnt_off00007afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFC 10500 bytes
SHA-256: 6c02439446c059d2cd811e7182c4f05593b27192818ae87773aea3c70351177e