Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1c3a8cdb31a11a…

MALICIOUS

PDF

40.7 KB Created: 2020-06-02 12:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2523677974ce9e856bcbf9085e8331d4 SHA-1: 11ea81d56878d8362b0a50963ed92767e58bc75a SHA-256: 5f1c3a8cdb31a11aa0b4f4850477a0fdf82469b2ccd7450a9aeca02c4c73b3ba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or host malicious content. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but it does contain a reference to 'making slime without borax' and the primary URL, suggesting a potential lure.

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://brandonjoneslmhc.com/uploads/1/3/1/4/131409861/131409861.html#making+slime+without+borax
    • http://time2gotravelwithsuzan.voyagerwebsites.com/uploads/1/3/0/4/130476505/mojezixemilitepo.pdf
    • http://laurenjohnstonduncan.com/uploads/1/3/0/7/130739452/zijakosixagerobukuj.pdf
    • http://mta-sts.mail.grandviewlodgeandresort.com/uploads/1/3/0/6/130620521/gusezojepozumev.pdf
    • http://anonymousebeauty.com/uploads/1/3/0/5/130545698/mapemakifaxowolofet.pdf
    • http://ogffl.com/uploads/1/3/0/6/130604209/guwujakona.pdf
    • http://roofcleaningpp.com/uploads/1/3/1/6/131637640/5377908.pdf
    • http://a4.denjac.com/uploads/1/3/0/6/130640010/bf277330838.pdf
    • http://touthome.com/uploads/1/3/0/4/130488940/zavigulotaxiletodev.pdf
    • http://elina-ja-aleksi.com/uploads/1/3/1/3/131381519/eb59c3d84.pdf
    • http://brandonjoneslmhc.com/uploads/1/3/1/4/131409861/terms.html
    • http://brandonjoneslmhc.com/uploads/1/3/1/4/131409861/dmca.html
    • http://brandonjoneslmhc.com/uploads/1/3/1/4/131409861/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dakemevodugu.files.wordpress.com/2020/05/jonojiwanotodaporakiku.pdf
    • https://zemuderowu.files.wordpress.com/2020/05/82802049149.pdf
    • https://toxabawepet.files.wordpress.com/2020/05/delalixoxoxipazudebegi.pdf
    • https://roderip.files.wordpress.com/2020/05/38986667858.pdf
    • https://lugolasef.files.wordpress.com/2020/05/kilabagubixo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007342.bin
51c250cfac5d1787ea3e08ad2e0a43109f2f778b898b166ea6de36ce84a64b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x7342 10680 bytes