Malicious PDF — malware analysis report

Static analysis result for SHA-256 498632bf527bc9f7…

MALICIOUS

PDF

44.3 KB Created: 2020-04-11 10:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f39634bb984ead6e607e993fcc2204d3 SHA-1: 4b95aa00dcf98d1c91f67d1614b06fee6aa7d9e0 SHA-256: 498632bf527bc9f72655a8a1d4d173e3b1062fdffa038308977112458dd16eae
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to a 'Detox diet plan pdf' and exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF files. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of linked PDFs, likely to distribute further malware or engage in SEO-based malicious redirection.

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://edgelandscapeandmaintenance.com/uploads/1/3/1/4/131482866/131482866.html#detox+diet+plan+pdf
    • http://camptruth.us/uploads/1/3/1/1/131164075/7990017.pdf
    • http://shrinksync.com/uploads/1/3/0/7/130776247/noberaletujolafamij.pdf
    • http://pfwinter.com/uploads/1/3/1/4/131453577/weguzal-jasefe-ziloripilumapuv.pdf
    • http://rechtsanwalt-freisberg.de/uploads/1/3/0/6/130639613/nujokepaguzez-fajomowotuma-raxaredubidazo-pezotutajekepu.pdf
    • http://7107restaurant.ph/uploads/1/3/0/7/130776330/xutabebomebomef-pasumo-lufafavunofuje-wilojabufata.pdf
    • http://hermaninvesting.com/uploads/1/3/0/2/130291585/maxikogakipeteke.pdf
    • http://greenstoneservicesinc.com/uploads/1/3/0/6/130621406/dovewasidesotararib.pdf
    • http://ustreehuggers.com/uploads/1/3/0/5/130542936/27ff2062.pdf
    • http://kaiserparmenente.org/uploads/1/3/1/1/131163897/bd1675acc5c3.pdf
    • http://kristendellapace.me/uploads/1/3/0/7/130775231/xotogefefagaje_detatu_tejikar_vijovaweso.pdf
    • http://bryanperrydev.com/uploads/1/3/0/3/130313403/lekomaxanapa_lotex_nefosefabojebim_ludosop.pdf
    • http://debbies-prayer.com/uploads/1/3/1/0/131070678/fekidolerataf-guxufiw-rutotin-resaresuses.pdf
    • http://kristendellapace.me/uploads/1/3/
    • 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_off00008417.bin
6bda6aa6ea7a7463f92c99b8a2b51bc50f71c264205092a972f36ddb57c36f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8417 8720 bytes

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