Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a731613223192e…

MALICIOUS

PDF

51.0 KB Created: 2020-11-06 15:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2613c0c8e164fc89d458838587032d18 SHA-1: 3e20fb59562435ffe714290622070356aa8b90bc SHA-256: a4a731613223192ebb03a5df0c7100654c7b7ddbdb6b26b75ddebb8424d82051
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The document body includes a URL that mimics a search query for a popular book, suggesting a lure to drive traffic to external sites. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate a potential for malicious redirection or content delivery, possibly leveraging PDF's scripting capabilities.

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://trafffi.ru/123?keyword=read+pride+and+prejudice+online+free+pdf PDF link annotation
    • https://fijuwokokaku.weebly.com/uploads/1/3/4/3/134382009/9f31cd08da2d62a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b76a6e43-e79b-49f6-acf7-d4ad3f8ba5eb/jibapobixupi.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/levetaledo.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/64399615617.pdfIn PDF document text
    • https://danusodemoza.files.wordpress.com/2020/11/53742760127.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://damilum.files.wordpress.com/2020/11/personnage__habiller_maternelle.pdfIn PDF document text
    • https://lirurib.files.wordpress.com/2020/11/kuroponevesaxajama.pdfIn PDF document text
    • https://rovafola.files.wordpress.com/2020/11/bruce_lee_le_jeu_de_la_mort_streamin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFF 4856 bytes
SHA-256: f0bac87ce80cb0d1b3c43d4ce1d25e2ca405e89749f972fc0c205fca9c80c68d
font_01_sfnt_off00008e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8E 10196 bytes
SHA-256: f07196881e471eaae47368dbfa245482f310d1eacd14d52de3a56c02ddcdb2d0
font_02_sfnt_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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