Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef26716efa694270…

MALICIOUS

PDF

46.5 KB Created: 2020-04-10 03:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2394bdc820b8a4eab55af2b2a2e1197e SHA-1: 38502c6873c4960189ed421d38de5cd019cd3188 SHA-256: ef26716efa694270eb6ea55f34fe7cd111345ecfc73168272822a7e5410be705
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique commonly used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a title related to self-help books, suggesting a lure to attract unsuspecting users. The primary attack pattern involves leveraging a link farm to distribute or redirect to malicious payloads.

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://mynaturalplayce.org/uploads/1/3/0/5/130543488/130543488.html#libros+de+autoayuda+para+adolescentes+mujeres
    • http://jennifermonson.info/uploads/1/3/1/3/131380183/kaxupodojofizivu.pdf
    • http://classicpinup.com/uploads/1/3/1/0/131071137/tajuzumirusubinunux.pdf
    • http://farmatriverpointe.org/uploads/1/3/0/5/130541351/zofelu-bizasozilegowim-wuxidepanufumon-nilatov.pdf
    • http://freedompropertymanagement.org/uploads/1/3/0/6/130640141/vurofugutenin-zevuk.pdf
    • http://ylentraineurpersonnel.com/uploads/1/3/1/3/131383747/xiwelatinef.pdf
    • http://oliviashimeld.com/uploads/1/3/0/7/130738748/jokipibitopik_japul_jelusaf_guvotoj.pdf
    • http://securitycars.us/uploads/1/3/0/6/130620747/1017035.pdf
    • http://aelogisticsservices.com/uploads/1/3/0/6/130605349/7052448.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_off000089d2.bin
c995301194f6533b04ad80c6d73ce7d9c27bb5f0c3991ad4e6bede7cfc4b96f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D2 9184 bytes

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