Malicious PDF — malware analysis report

Static analysis result for SHA-256 605adb7ea27cdd2a…

MALICIOUS

PDF

41.0 KB Created: 2020-04-13 07:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 997c9c853f500688dde26a6166fe7fae SHA-1: 3ca18e4d5ea2dd12c3b1716fd647289dbdc4acc7 SHA-256: 605adb7ea27cdd2a7c9383bbdbc1e7e4935994bc88ff1ce908485a8c745f561d
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL points to a page that itself contains a link to another PDF, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link distribution. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to direct 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://ezit.solutions/uploads/1/3/0/6/130640046/130640046.html#plan+de+estudios+ingenieria+industrial+ucr
    • http://wetreflectionstx.com/uploads/1/3/1/4/131407734/bowegesisitafi-vunifusejaka.pdf
    • http://suministrodemedicamentos.net/uploads/1/3/0/8/130874672/6f829bec9edc9.pdf
    • http://paulaluethensoper.com/uploads/1/3/0/4/130483285/gadefazok.pdf
    • http://eliteretirementsolutions.com/uploads/1/3/0/7/130775725/a9df27d.pdf
    • http://prairiepatch.net/uploads/1/3/0/6/130621698/626391.pdf
    • http://matajagad.com/uploads/1/3/0/8/130874498/1e4deab96.pdf
    • http://kentuckyroadband.com/uploads/1/3/0/8/130814360/7c8706eb1fd3307.pdf
    • http://seethroughcleaning.com/uploads/1/3/0/9/130968967/3796746.pdf
    • http://moscowtutoring.ru/uploads/1/3/1/4/131453294/nosibiza-zudugatizu.pdf
    • http://memberslog.com/uploads/1/3/0/5/130547728/8167779.pdf
    • http://hospitalitymelbourne.com/uploads/1/3/0/5/130551059/viwixodipujuk.pdf
    • http://smartstudiosystems.net/uploads/1/3/0/6/130620467/3639594.pdf
    • http://atlantaclassicstees.com/uploads/1/3/1/6/131606552/sefekomo-sarovukaj.pdf
    • http://mccoypropertyholdings.com/uploads/1/3/0/2/130289765/simazavaxafutuxe.pdf
    • http://nazirene.net/uploads/1/3/0/6/130604487/12cc485faef6f42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c65.bin
71ae7d50f36b835c41aa58fac573d875f3b8af0158c61d0ccce7868c94611a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C65 9192 bytes
font_01_sfnt_off00008da8.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA8 2600 bytes

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