Malicious PDF — malware analysis report

Static analysis result for SHA-256 342910ee9c423ad7…

MALICIOUS

PDF

33.5 KB Created: 2020-05-16 04:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5755299f0cda0a7ae66bdd5985f7a26 SHA-1: 49fbf2ea7eb53cec377c7ce3dd29730aebba07d9 SHA-256: 342910ee9c423ad7b6d8a4ef3e934c334507c3b2e7b50c1819a363d140ed5da0
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded 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. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'Breast cancer margins guidelines' and authoring application details, but the primary malicious activity appears to be the mass redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mckennakasper.com/uploads/1/3/1/8/131871817/131871817.html#breast+cancer+margins+guidelines
    • http://greissbuilders.com/uploads/1/3/0/8/130813649/gotawani.pdf
    • http://tree-care.net/uploads/1/3/0/6/130604185/lunaxuvimipote_newufixek_tefokew_javeferekez.pdf
    • http://wobblykittyart.com/uploads/1/3/0/6/130621831/656aaf39179.pdf
    • http://twointernational.net/uploads/1/3/0/4/130488955/puxisulobimav.pdf
    • http://mchdehs.org/uploads/1/3/0/5/130545698/gepiwijuz.pdf
    • http://madisonandwhite.com/uploads/1/3/1/6/131636828/2282760.pdf
    • http://myenlighteningexperience.com/uploads/1/3/0/9/130969645/9273751.pdf
    • http://rootnotchs.com/uploads/1/3/0/8/130874347/gefakafo.pdf
    • http://ibrafertil.com/uploads/1/3/0/4/130483207/nudowodiladixinolus.pdf
    • http://taproject.net/uploads/1/3/0/6/130604838/wafaridowibib_nokaxaj_lokamivamuwisel.pdf
    • http://numaducacasa.com/uploads/1/3/1/3/131398059/2846813.pdf
    • http://eltconstruction.com/uploads/1/3/1/3/131381045/119dafdd.pdf
    • http://apositivelight.org/uploads/1/3/1/1/131163902/4084956.pdf
    • http://yosemitefineartacademy.com/uploads/1/3/0/6/130621213/7748797.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000581a.bin
238e4909d1cc1f4b32f8cfb0eb55678c7d7abde6ef911ff1604267b97bc8dffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x581A 10112 bytes

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