Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe52b701351ca41…

MALICIOUS

PDF

38.7 KB Created: 2020-03-09 11:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5b7782b0d695168967152b13afc7e48 SHA-1: 8c3dbe158234505127f3b89deb49bb82239964eb SHA-256: 3fe52b701351ca413e563b948de3e7e60c65859369085504b48615f8289f5ff1
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. The embedded document body text, though partially corrupted, contains a URL that is also listed among the extracted external links, reinforcing the attack pattern.

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://morningpeople.club/uploads/1/3/0/8/130814129/130814129.html#streptomyces+aureofaciens+tetracyclines
    • http://foundationforacademicrelief.ca/uploads/1/3/0/7/130738625/1c492e535040006.pdf
    • http://elliott-wright.com/uploads/1/3/0/6/130620142/sovudufunedemodak.pdf
    • http://fitzsdresses.com/uploads/1/3/0/6/130604804/petataje.pdf
    • http://kelseyhopebrewer.com/uploads/1/3/0/5/130551055/birexozurenup.pdf
    • http://amysbargainoutlet.com/uploads/1/3/0/7/130738830/nipekofokupu.pdf
    • http://mojonz.co.nz/uploads/1/3/0/5/130541445/617544.pdf
    • http://hong-kong-nashville.com/uploads/1/3/0/5/130589342/xetorewapojopesel.pdf
    • http://www.debtfreein365days.com/uploads/1/3/0/5/130590142/fexugavogig.pdf
    • http://mobilhomebluesky.com/uploads/1/3/0/6/130639841/sabida-feseda-zipafozaxujo.pdf
    • http://jmandyam.com/uploads/1/3/0/7/130739069/9762711.pdf
    • http://www.peifitness.com/uploads/1/3/0/3/130379272/d1bbab1785f9d32.pdf
    • http://booksandplant.com/uploads/1/3/0/4/130483393/nesinigeb_poris_tezumemuw_pamamepolivoza.pdf
    • http://myschoodle.net/uploads/1/3/0/6/130640006/eb3371d.pdf
    • http://backontrackagent.net/uploads/1/3/0/4/130483275/2285050.pdf
    • http://mooseandmagpiefarm.com/uploads/1/3/0/6/130620657/8cfbc05c7f952.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_off00006f4d.bin
1a52675f9b2b1d6e28154665804c0deb677d94cc3fe3d8997eddcb007ef54cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 7920 bytes

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