Malicious PDF — malware analysis report

Static analysis result for SHA-256 34464b5196b82550…

MALICIOUS

PDF

40.9 KB Created: 2020-11-09 16:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0140fd041f638b828de363aecf07dcd6 SHA-1: 19aa7f90b0f88ce27cceff3c6a9f9c11bbc67a3d SHA-256: 34464b5196b82550fe5f76705cd342af0e04adbc085624db540b52e84663df09
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with one prominent URL being https://trafffe.ru/123?keyword=kalender+2020+skriva+ut. The ML classifier strongly indicated maliciousness, and the document body, though partially obfuscated, includes this URL and others, suggesting a tactic to drive traffic to potentially malicious or SEO-spam sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://trafffe.ru/123?keyword=kalender+2020+skriva+ut PDF link annotation
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/rofajakulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_5f9e54970cf6c.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/luwemafabasiv_memekamunef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_5fa7e9d12e740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5fa24a96cf26f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5f8f3086e83dd.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/somamere/the_story_of_an_hour_annotations.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/vugizejenuvodinixozuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d135d131-a342-4015-8635-7c8b155bc298/wumezadesipuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/583e2a22-a7f4-40b5-9a2a-97c3bf6d1ba3/70303106165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687c23ec-8cf8-4640-a9d0-a6fa3d49ca63/thanh_kinh_cong_giao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc8d1b4-974d-40dc-bdbc-2b09c4cfa4ee/smith_pocket_pal_knife_sharpener_instructions.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_off00006214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6214 5184 bytes
SHA-256: d5fb4448660cd633a70b75b915fc4147a71b3eed5f4c658898561af65c5a590d
font_01_sfnt_off000073c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 10256 bytes
SHA-256: a79d23db9134428c546208f955ecd610d902cad7d03d3c15ee411003cdc2a571

Open this report in the interactive analyzer, or submit your own file for analysis.