Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d925b8f2e85bf78…

MALICIOUS

PDF

37.1 KB Created: 2020-06-10 00:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ec69636d6fe34b39ee484dfdebdbf0c SHA-1: b2894c8cb2ca109e1be770d1358fe8f92962c205 SHA-256: 7d925b8f2e85bf7805a14644b96c12657e2c487306b4313ace07ce3a79858182
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO spamming operation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous external links suggest the document's primary purpose is to redirect users to potentially malicious or unwanted content hosted elsewhere.

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://gu.undesirable.us/uploads/1/3/0/4/130478709/130478709.html#atrav%25C3%25A9s+de+sangue+atrav%25C3%25A9s+de+pdf+de
    • http://10anos.net/uploads/1/3/0/6/130639369/fuzurababujafazi.pdf
    • http://familyamongsteverything.com/uploads/1/3/0/8/130874034/ruvuzovi_linafagapipobij.pdf
    • http://cpanel.creativevisionhome.com/uploads/1/3/1/6/131606149/5613ae2265797eb.pdf
    • http://wilkesbarrebouncehouse.com/uploads/1/3/0/6/130639943/1099597.pdf
    • http://smartmtinvestments.com/uploads/1/3/0/8/130813961/lomafibulegu_vuruvifazakadew.pdf
    • http://wanbaoluyulechengduchang.br3h.com/uploads/1/3/0/4/130436020/xesuraxedolan.pdf
    • http://sgbhair.shop/uploads/1/3/1/4/131454345/jasabaxanediza.pdf
    • http://mail.moofish.co.nz/uploads/1/3/1/4/131409210/gogemutalimanamu.pdf
    • http://summermathtalks.com/uploads/1/3/0/2/130272381/628265.pdf
    • http://mta-sts.mail.hsi-electrical.com/uploads/1/3/1/1/131164393/retukama.pdf
    • http://mta-sts.mx.akimhemangcdc.org/uploads/1/3/0/6/130620897/maxuga.pdf
    • http://appllancepro.com/uploads/1/3/0/7/130738662/mabefaruxagigasakaso.pdf
    • http://nobuhotels.devsite-1.com/uploads/1/3/1/4/131406104/072f8.pdf
    • http://gretamarchesi.com/uploads/1/3/1/4/131453170/kigolujenugiro-vesad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rokojozosiwi.files.wordpress.com/2020/06/zawexuwukujuzejafewin.pdf
    • https://xevabutifun.files.wordpress.com/2020/06/nawutumusigil.pdf
    • https://bejadapi.files.wordpress.com/2020/06/risopesewab.pdf
    • https://mosozedegan.files.wordpress.com/2020/06/favuwurorebosipeda.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000608a.bin
d8c499f6d0eea9c6f4ab83a611914d355a9411f48d92d1e71c0cfc8a37e98e31
pdf-font-stream PDF embedded font (sfnt) at offset 0x608A 12768 bytes