Malicious PDF — malware analysis report

Static analysis result for SHA-256 094b5f65dc8692d8…

MALICIOUS

PDF

40.7 KB Created: 2020-03-24 07:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 204cfd73fdae7324b4d38273a1c4f8da SHA-1: aa19962e16be0991deaf757954a3a8402b6b1a5b SHA-256: 094b5f65dc8692d8bce348d9b9b895ab05062ff98f5a2c0a049d290028c98bb5
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

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://taliacarlisle.com/uploads/1/3/0/6/130605124/130605124.html#compute+direct+materials+price+and+quantity+variances
    • http://autodiscover.teambuildingidaho.com/uploads/1/3/0/6/130639212/03452e.pdf
    • http://huskieeats.com/uploads/1/3/1/0/131071041/cb61d.pdf
    • http://myarchaic.com/uploads/1/3/0/2/130272363/1111601.pdf
    • http://myinklady.com/uploads/1/3/0/6/130640162/bativokekaxo_tazunusabite.pdf
    • http://napervillecarpetclean.com/uploads/1/3/0/6/130605080/d93ac8.pdf
    • http://orchardcreeksoaps.com/uploads/1/3/0/4/130477228/maboxe.pdf
    • http://www.blackwinghunting.com/uploads/1/3/0/6/130620266/xowepi-purijejes-gejugidaga-juxasujidere.pdf
    • http://sisterpeterduck.com/uploads/1/3/0/6/130621178/55e0fa23f2be591.pdf
    • http://www.alinea-graphicdesign.com/uploads/1/3/0/5/130550880/bavivijanuje-kedixefetapa-zaduw-seranifoko.pdf
    • http://jordantransportationllc.com/uploads/1/3/0/4/130488181/bb4602.pdf
    • http://smileyboyproductions.com/uploads/1/3/0/5/130588663/buwaxawin_xofifaralo.pdf
    • http://posters-rock.com/uploads/1/3/0/8/130874272/4033434.pdf
    • http://www.daydreamhemp.com/uploads/1/3/0/6/130639542/matapavixixunemube.pdf
    • http://cpanel.thesnakecatcher.com.au/uploads/1/3/0/6/130639467/fa61beec55d8d7c.pdf
    • http://ezyfix2u.com/uploads/1/3/0/7/130776230/899271.pdf
    • http://introvertssquaredshop.com/uploads/1/3/0/7/130775537/dcdbcd8f7e1.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_off000073c4.bin
ef926b81b22812f8627cf41763e0810ba872728328f5d67219d235de88d4dcb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C4 8664 bytes

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