Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c67cf8289629179…

MALICIOUS

PDF

34.9 KB Created: 2020-11-07 20:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 48d4a396a12bb694bb525f3bddf6a00c SHA-1: 9c8d6201ac0638ee78371b1a5985a3c2b999af89 SHA-256: 3c67cf828962917915ad45873c31ec0499073e8aa29999d9ee50ebb5cd3246d1
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 of which are hosted on strikinglycdn.com, suggesting a link farm or redirection scheme. One prominent URL, https://trafffi.ru/123?keyword=trojan+cargo+sales+llc, is directly associated with the 'trojan cargo sales llc' keyword, indicating a potential lure for malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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://trafffi.ru/123?keyword=trojan+cargo+sales+llc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5f9b85261ba46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_5fa379007fb21.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/e8352143-0a43-4d1c-b43d-bceae5da11fa/98848727163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6347ec-791a-464a-9d9d-29bbe3da21aa/86311787335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d7ab17-d696-4152-87fe-c95698680030/pebis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474b3643-bbdc-4e09-ba38-1257c51facf7/wavivuboko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55873f8-5fd4-4edf-ae22-183767c09164/gikefuniwenozegufajer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5110ff4-452f-4128-9ac8-8933c99bff89/deadly_ghouls_of_the_commonwealth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75dc65f-81eb-4f09-8efb-ee7dd70590fa/batokenazop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82138dc-5f08-45c1-925c-7433db2857f6/ejercicios_de_ecuaciones_diferencial.pdfIn PDF document text
    • https://bitesoz.files.wordpress.com/2020/11/xanexajajupazuwaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4149f836-62dc-40a7-89e3-c8b8e8e3e699/22670926526.pdfIn PDF document text
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdfIn PDF document text
    • https://sazaluxi.files.wordpress.com/2020/11/49356393139.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_off00004c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0F 4992 bytes
SHA-256: 1d20055cb61fe5f1392e007dfaa21a4dafde3c59dd48b425f494e7fe73505ca8
font_01_sfnt_off00005d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 9916 bytes
SHA-256: 704879fe541f0af0a20cdc5ebf095d633ce9054711cf29e64a2bbae0832150fd