Malicious PDF — malware analysis report

Static analysis result for SHA-256 df985fc910bede07…

MALICIOUS

PDF

43.2 KB Created: 2020-11-08 11:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: df4c31145cbf0cb5d26f05461934fc5a SHA-1: b27bccedab1ada9583df468fdab3fbfc682f262c SHA-256: df985fc910bede074aef8c3e4725e800ad8c9f9c55c2475c5cf65b669349f65c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://traffking.ru/123?keyword=organism+meaning+in+science PDF link annotation
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/jilama_wonizorabide_foxiviv.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/8715300.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/7084757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5f9271e9d1bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f8c1335b51f6.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/70a072.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/8857901.pdfIn PDF document text
    • https://tovepeluzon.weebly.com/uploads/1/3/4/3/134385389/4bd4917287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mabimufifu.files.wordpress.com/2020/11/69702276747.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://zasegurixesu.files.wordpress.com/2020/11/coulson_and_richardson_chemical_engineering.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.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_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 5116 bytes
SHA-256: 49532b50641238773673e8ebff82941df7600ad7135610bff2318f0481e2e11b
font_01_sfnt_off00007daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAA 10116 bytes
SHA-256: c4378ec42889e5e49b48ed1970e9227d1c31712eeabde80cfdeabb1a0a704684

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