Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdcc051064cb830…

MALICIOUS

PDF

43.5 KB Created: 2020-03-20 06:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc1fa5334f4c61730852b416b0d2c4fc SHA-1: cd1109038f6d46d6b8748b95ea9178202ea8a343 SHA-256: 2fdcc051064cb8303251b122eaf09400084426254887d045a67dab8a920ee09f
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains text related to elliptical reviews and mentions the wkhtmltopdf application, suggesting it was generated programmatically. The primary intent appears to be directing users to a multitude of external PDF files hosted on various domains, likely for SEO manipulation or to serve as a distribution point for further malicious 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://gracecartercapstone.com/uploads/1/3/0/5/130544147/130544147.html#sole+e25+2019+elliptical+reviews
    • http://becomeamedicareagent.com/uploads/1/3/0/4/130488244/1980925.pdf
    • http://hostmaster.arisaigarchery.co.uk/uploads/1/3/0/3/130313286/f9be3007f0.pdf
    • http://www.henysinvestment.com/uploads/1/3/0/6/130605030/1fdf5001b0.pdf
    • http://mail.beachgallery.com/uploads/1/3/0/4/130476263/bozogisifomas-morigu-sisufu-zupuze.pdf
    • http://nobeya.com/uploads/1/3/0/3/130323180/5523122.pdf
    • http://mail.boehmschapel.org/uploads/1/3/0/9/130969905/widogolodujodoj-dotojamet-wufarufelijipov-zapebe.pdf
    • http://mountainpinestreetreachprogram.com/uploads/1/3/0/6/130620684/77837.pdf
    • http://theatteberrys.com/uploads/1/3/0/8/130873852/kivujipaxiwebafamif.pdf
    • http://dakotaashleymarie.com/uploads/1/3/0/2/130273915/2eb3e69.pdf
    • http://sewcreativetx.com/uploads/1/3/0/7/130776433/gatizizoxexujajixolo.pdf
    • http://www.southernmnmidwifery.com/uploads/1/3/0/7/130738912/3682748.pdf
    • http://privatebartenderneworleans.com/uploads/1/3/0/5/130539678/berudorukadexe.pdf
    • http://www.vancouverhairmakeup.com/uploads/1/3/0/6/130639546/3653591.pdf
    • http://langerworden.nl/uploads/1/3/0/6/130640197/4826988.pdf
    • http://petercdoffing.com/uploads/1/3/0/6/130605335/jiraropevuko-butotere.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077d5.bin
5c98e2ff4a74e7a447f54c69e3137c29af0600bc5606a92ac3cef8aee418733c
pdf-font-stream PDF embedded font (sfnt) at offset 0x77D5 8072 bytes
font_01_sfnt_off00009746.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x9746 2616 bytes