Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4310f212e5c4643…

MALICIOUS

PDF

28.9 KB Created: 2020-06-10 05:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a5fc6eb9195ee647a3612e123cc75e SHA-1: 0918ebb28d5d25868892a6764abb2d095f33b648 SHA-256: c4310f212e5c4643abe03e83a72943e78f4606ffc5bd1ec176914bf007199669
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains a large farm of external links. The document body, though partially corrupted, contains text related to a Spanish textbook and embedded URLs. The primary attack pattern appears to be SEO poisoning or a link farm designed to redirect users to potentially malicious content hosted on multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://cdatcenter.org/uploads/1/3/0/3/130379430/130379430.html#libro+de+espa%25C3%25B1ol+secundaria+primer+grado
    • http://mail.straghalis.com/uploads/1/3/0/7/130775446/7d3d44af2.pdf
    • http://thesoonernetwork.com/uploads/1/3/0/5/130590474/08c9478d3a49417.pdf
    • http://barstarcity.com/uploads/1/3/0/3/130323556/1578528.pdf
    • http://freelivinco.net/uploads/1/3/0/7/130775980/fepat.pdf
    • http://jacobshawaiifarm.com/uploads/1/3/0/3/130379213/moferozivulepe.pdf
    • https://juvivava.files.wordpress.com/2020/06/tukuzimudikus.pdf
    • https://vimagifa577894512.files.wordpress.com/2020/06/11858790648.pdf
    • https://gofiteturape494264367.files.wordpress.com/2020/06/jimegezavuxefuvufasusutaf.pdf
    • https://rebenesorove.files.wordpress.com/2020/06/5797411300.pdf
    • https://kigojod.files.wordpress.com/2020/06/mabejinadexosopinisowapo.pdf
    • https://segokowiw.files.wordpress.com/2020/06/wetilowudafofoxixaniwexu.pdf
    • https://jejefunudod.files.wordpress.com/2020/06/sopumojurosogevi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045c0.bin
651e43d93fe98c601544e3e9cebdc579fd6491d2fcf8ffece7c5a76a21480cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45C0 9864 bytes

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