Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c21a17893addf85…

MALICIOUS

PDF

37.3 KB Created: 2020-04-06 03:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 059866e2f6070f2e6a8f7b03cac1543a SHA-1: f8dfffb54fe628add3a300b2fb61abeefaebac9d SHA-256: 6c21a17893addf85cdae89cc2b51f18172ee6337260684b99e295946ba1c01b2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or a distribution mechanism for further malicious content, potentially leading to a phishing or malware download scenario.

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://theovercomersblueprint.com/uploads/1/3/0/5/130538870/130538870.html#ejercicios+palabras+acabadas+en+d+y+z
    • http://fttsl.com/uploads/1/3/0/5/130590739/fb9fe39d23b6.pdf
    • http://cattitudesweden.se/uploads/1/3/1/1/131164090/cd0c298e5c.pdf
    • http://buildingcrews.com/uploads/1/3/1/4/131453555/3531078.pdf
    • http://coachjordanmyers.com/uploads/1/3/0/5/130551247/pokavebawemi-disaz.pdf
    • http://islandexcellencetoastmasters.com/uploads/1/3/0/5/130539516/jeredove.pdf
    • http://5starlifestylehealth.com/uploads/1/3/0/6/130621979/3774200.pdf
    • http://eorganics.org/uploads/1/3/1/3/131380754/lexubuge.pdf
    • http://parlorbearcandleco.com/uploads/1/3/0/6/130620859/xukugero-revajajot-tezivili.pdf
    • http://chuckanutbaycottage.com/uploads/1/3/0/7/130738883/6c934b184c991.pdf
    • http://willellastock.com/uploads/1/3/0/8/130813531/nefeziwezip.pdf
    • http://4w4r3.com/uploads/1/3/0/5/130588880/6974779.pdf
    • http://happynings.net/uploads/1/3/0/9/130969838/logasibalibo.pdf
    • http://7hbuildingsupplies.com/uploads/1/3/0/7/130738596/e23321d61333657.pdf
    • http://cahoje.com/uploads/1/3/0/8/130814187/kekodaridovir.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_off000067b1.bin
93c52236fa961515297d420d495dd2d642840ae60310cffe7190493c2b2c9aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 8460 bytes

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