Malicious PDF — malware analysis report

Static analysis result for SHA-256 0925b4ab0edffeaf…

MALICIOUS

PDF

35.9 KB Created: 2020-03-29 06:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 317650e493d803f8e95fe4c757020d2a SHA-1: 5fec5be1e4e2855acff8b8eae9c7754d65cabe98 SHA-256: 0925b4ab0edffeaf69cf5bc7f5370e93b81559ce2ec5b518bee83b61cd656420
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which are structured as a link farm, suggesting an attempt to manipulate search engine rankings or direct users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external links points towards a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

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://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/8/130814642/130814642.html#finding+surface+area+from+nets+worksheet
    • http://brokerjana.com/uploads/1/3/0/2/130270994/fexenade.pdf
    • http://vuorenrinteentila.com/uploads/1/3/0/3/130313190/4898936.pdf
    • http://jsconsultingmaui.com/uploads/1/3/0/5/130550910/jevesesurulipefilud.pdf
    • http://wildernesscreativeco.com/uploads/1/3/0/6/130604872/vafovevi.pdf
    • http://glenhouseplants.com/uploads/1/3/0/6/130604254/sedadarabefoxum.pdf
    • http://stromberglab.com/uploads/1/3/0/6/130620997/3a2557.pdf
    • http://maddywoodman.com/uploads/1/3/0/5/130544191/a739a120f436a93.pdf
    • http://www.aroma-rodhom.com/uploads/1/3/0/7/130740609/b01a1444cabd2.pdf
    • http://lynnhavenmanor.com/uploads/1/3/0/9/130968995/9902859.pdf
    • http://joedefeo.net/uploads/1/3/0/6/130604972/4972811.pdf
    • http://ecuador-seo.com/uploads/1/3/0/6/130604179/bifife_nefutikebol_kuraf.pdf
    • http://mordecaimatters.com/uploads/1/3/0/8/130814076/difimu.pdf
    • http://mta-sts.mail.dinothetourist.com/uploads/1/3/0/6/130605218/f8c83e.pdf
    • http://juanlomeli.com/uploads/1/3/0/4/130436074/bejewijepakada.pdf
    • http://allamericanhousesitters.com/uploads/1/3/0/8/130874201/loraxowani_bemikaw_dozunexekotobuz.pdf
    • http://mywashcard.ca/uploads/1/3/0/6/130621646/9609128.pdf
    • http://wildarborfarm.com/uploads/1/3/0/6/130621083/4243469.pdf
    • http://kaymesia.net/uploads/1/3/0/4/130483062/moxuzulaxuziboboxi.pdf
    • http://www.audioworx.ca/uploads/1/3/0/5/130544147/kagawigel-dusaviwezeda-rotapepugugob-pegadux.pdf
    • http://tabletopcommunications.com/uploads/1/3/0/4/130491075/36239.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_off000065f8.bin
d788bb53f8884aa55c39fcab0532f73da207c7ed60a15c6647dae7613dcdbef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F8 7032 bytes

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