Malicious PDF — malware analysis report

Static analysis result for SHA-256 e536748eeecddbd8…

MALICIOUS

PDF

37.3 KB Created: 2020-03-27 04:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1838045b44e79129e432005c7f61bf8c SHA-1: 847811bce8c3c322c0b0a3cdc7a281861686f916 SHA-256: e536748eeecddbd833aa3a22e357c070297d259deb7d3d7aa25cbf2f68e03627
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL pointing to a PDF related to 'suma y resta de fracciones de distinto denominador'. The primary function appears to be a link farm, likely for SEO manipulation or to distribute further malicious content via the numerous linked PDFs. No scripts were extracted from this sample.

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://sunchoice.org/uploads/1/3/0/5/130588698/130588698.html#suma+y+resta+de+fracciones+de+distinto+denominador+pdf
    • http://www.kcce.kz/uploads/1/3/0/6/130622076/rofabi.pdf
    • http://unitedhaitiansofamerica.org/uploads/1/3/0/6/130621755/2287068.pdf
    • http://insure-web.com/uploads/1/3/1/0/131069750/c92e9d3b27.pdf
    • http://cocktailsnponytails.com/uploads/1/3/0/7/130776312/rixejitumemol-zibomej.pdf
    • http://eurekaarchi.com/uploads/1/3/0/4/130489123/ralove.pdf
    • http://ginnypittman.com/uploads/1/3/0/5/130589433/pobabubidunugaguwoma.pdf
    • http://thekindingergroup.com/uploads/1/3/0/6/130639087/munurexeporisudun.pdf
    • http://davekuhn.com/uploads/1/3/0/6/130604114/texapetinorofe.pdf
    • http://jullisaenterprise.co.uk/uploads/1/3/0/6/130620300/xekinetejixowi.pdf
    • http://benzunhinged.net/uploads/1/3/0/7/130739462/gilezisob-zoralupatuden-putaxulum-somizeguwosobot.pdf
    • http://amillionbooks4amillionkids.org/uploads/1/3/0/5/130540026/duvufigopoposif.pdf
    • http://mta-sts.naturalsound.com.pl/uploads/1/3/0/3/130313127/sesexiwo_gesurineweru_tapetogulovu.pdf
    • http://tacos-del-valle.com/uploads/1/3/0/7/130776056/doxawawegemo-tadabosiloniw-zusuge.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_off000066ed.bin
d435b715ce0450614681c9818ff1acfa4d5dd617cdb9019824881c59944002cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66ED 8332 bytes

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