Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3160f10fd4d557…

MALICIOUS

PDF

47.7 KB Created: 2020-11-08 09:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: be5d1d5917d311f686e261c5c4b54088 SHA-1: 121c16012750b6cb8dc6164173b89329b7c0cb11 SHA-256: fb3160f10fd4d557e861ced999fe2f29ba69eb81e6acf95b9d657f9aa3ea8219
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=sebald+austerlitz+pdf PDF link annotation
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/fdb5cd5f72.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/bifize.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/c71acf35-8f54-42e8-88c5-f8651c9c853b/51963073705.pdfIn PDF document text
    • https://pirurupi.files.wordpress.com/2020/11/fakaxajafadamotules.pdfIn PDF document text
    • https://gavedejeriro.files.wordpress.com/2020/11/48111867661.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://wikilebe.files.wordpress.com/2020/11/osamu_dazai_no_humano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb849d3-e16b-4a34-92cd-5e3da28bdfac/dagazawevafelapumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb745e47-d461-4fc5-bbec-de5c95a8e2b5/vuxidakafijerogojo.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/duxerubiwejekifesitafi.pdfIn PDF document text
    • https://tutitogigu.files.wordpress.com/2020/11/11656611734.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_off00007891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 5328 bytes
SHA-256: 76aa836086a4c255125bf529a9d240764dfd029f58ec5cc2b26e24fbf8c6afa4
font_01_sfnt_off00008abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABE 11548 bytes
SHA-256: 6d5271ac0b3243b361489b550ca0aa7657a104eca0a310b9018e5d5c1683147f

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