Malicious PDF — malware analysis report

Static analysis result for SHA-256 c573494076c98cfc…

MALICIOUS

PDF

34.3 KB Created: 2020-04-21 16:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e441319b623e4f04de29a78327425b8d SHA-1: 0656f872938f77ea8309a8b1fe748bdd89de12a9 SHA-256: c573494076c98cfc856ceb3ac525036a2729cde7ab2c5c01f7f960817941768b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a high likelihood that these links are intended to redirect users to malicious or phishing sites. The ML classifier also strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body content is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ecgcore.com/uploads/1/3/0/6/130622032/130622032.html#antagonist+and+protagonist+worksheets
    • http://ecopoobags.com/uploads/1/3/0/6/130639895/3837801.pdf
    • http://bostontangofestival.org/uploads/1/3/0/3/130313459/xetiwa.pdf
    • http://phoenixemporium.ca/uploads/1/3/1/3/131381151/3961304.pdf
    • http://cynthiarichardsforohio.org/uploads/1/3/0/3/130379864/12e2e8f4e4fb.pdf
    • http://aseantracking.asia/uploads/1/3/0/6/130604944/15f2a76.pdf
    • http://worldsintowords.com/uploads/1/3/0/6/130640049/tafikezawo_radufelajujivu.pdf
    • http://yogawithcasey.org/uploads/1/3/1/0/131070695/67e6e90c4746.pdf
    • http://alexmonastra.com/uploads/1/3/0/5/130589216/genopux_mesexija.pdf
    • http://forestparkyoga.com/uploads/1/3/0/4/130488829/jubisopopumibe.pdf
    • http://pogorings.com/uploads/1/3/0/7/130776416/6678595.pdf
    • http://lifetobedetermined.com/uploads/1/3/1/4/131453049/38cf8f150c92ce.pdf
    • http://higherherbs.com/uploads/1/3/0/5/130544295/xanuwu_dugunixafepop_muzuzo.pdf
    • http://coolspaceairconditioning.net/uploads/1/3/0/6/130620379/puzofamavis.pdf
    • http://aseantracking.asia/uploads/1/3/0/6/13060494
    • 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_off00005c76.bin
19290d43943b9a3853aae623c4c5e5bb3cefdb58de653a6db84634bcb31e66c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 8024 bytes

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