Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b62904d2acb3282…

MALICIOUS

PDF

35.7 KB Created: 2020-04-12 09:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 54de2eb04aa68044a01e3b628109bf15 SHA-1: 44396068e5cb5e603df997f44422dbc04bd696f0 SHA-256: 5b62904d2acb32821bf5eb3c1768a8aae068b28073dbb4c7c6177459c1957f45
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or a distribution mechanism for further malicious content. The document body is obfuscated and appears to contain embedded URLs, which are likely used to redirect users to malicious sites or download further payloads. The presence of numerous external links points towards a tactic of SEO manipulation or hosting malicious content on compromised websites.

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://changeappllc.com/uploads/1/3/1/4/131453449/131453449.html#honda+gx390+13+hp+engine+manual
    • http://embodiedentertainment.com/uploads/1/3/0/5/130547812/japakegep-lanudurokan.pdf
    • http://holyfamilytopeka.com/uploads/1/3/0/5/130541308/40fed4c4d16ca7.pdf
    • http://chandlerpondoutfitters.net/uploads/1/3/0/7/130738943/lokupureruxo.pdf
    • http://swellnessspa.com/uploads/1/3/0/5/130547150/puxefovijogen.pdf
    • http://thepinkwidow.com/uploads/1/3/0/5/130543996/povawogo-turitadesogaj-vuwoxowus.pdf
    • http://neue-literatur-berlin.de/uploads/1/3/1/3/131380420/rumusoxisebigesew.pdf
    • http://quantumreligiouseducation.com/uploads/1/3/0/2/130289524/kasurisivivug_butiretutemif_wiwiduxada.pdf
    • http://twistedpixiephotography.com/uploads/1/3/0/4/130475939/meruf-faxeziki-zalujanaxenitad.pdf
    • http://shoplashesbrowsandmore.com/uploads/1/3/0/5/130550738/varido.pdf
    • http://openingrestaurants.com/uploads/1/3/1/4/131452941/sekunodol.pdf
    • http://ginnyharris.com/uploads/1/3/0/8/130814186/8ddb12c506f5.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_off00006369.bin
4fb9ed48fc9f5a13d141d59f47cb7705b7c4af46c5658780d4a03dc64cfc98b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6369 7716 bytes

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