Malicious PDF — malware analysis report

Static analysis result for SHA-256 410c49b57b861486…

MALICIOUS

PDF

67.6 KB Created: 2020-06-11 23:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 06e8f11d38882df4b6f17dfbbc8060ee SHA-1: 1b6a6e89ab2091eb5836d8151a465ccb38653020 SHA-256: 410c49b57b8614868b743c51db01836fac9c1e20c2f5593f507948faee929cb9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicates maliciousness. The presence of numerous PDF_URI and PDF_SEO_LINK_FARM heuristics confirms the suspicious linking behavior. No scripts were extracted from this sample.

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://2m6.undesirable.us/uploads/1/3/1/4/131452923/131452923.html#secondary+hyperparathyroidism+guidelines PDF link annotation
    • http://technobox.com.au/uploads/1/3/0/2/130291624/9779698.pdfIn PDF document text
    • http://dreammakersdesignco.com/uploads/1/3/1/3/131380390/kizese.pdfIn PDF document text
    • http://thekitchensinkmusic.ca/uploads/1/3/0/6/130604456/6901967.pdfIn PDF document text
    • http://mta-sts.mx.jafsc.org/uploads/1/3/0/8/130815080/4153010.pdfIn PDF document text
    • http://cronindefensestrategies.com/uploads/1/3/0/5/130538862/jukuj.pdfIn PDF document text
    • http://forestfueles.com/uploads/1/3/0/5/130589036/c78c0d3744c.pdfIn PDF document text
    • http://mail.anchorfloral.com/uploads/1/3/1/4/131452982/pukowadigaxa_narotososabiza_zidokezul_vepadolojejiroj.pdfIn PDF document text
    • http://mta-sts.swiftswcd.org/uploads/1/3/1/8/131858403/mabegire.pdfIn PDF document text
    • http://emilydelbridge.com/uploads/1/3/0/2/130291908/rawox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gunamitiluj.files.wordpress.com/2020/06/kujiwexamoxepapen.pdfIn PDF document text
    • https://zujuluwepig.files.wordpress.com/2020/06/92685168812.pdfIn PDF document text
    • https://nodezebibun.files.wordpress.com/2020/06/15573153166.pdfIn PDF document text
    • https://rilusepo.files.wordpress.com/2020/06/lomorawam.pdfIn PDF document text
    • https://levamine.files.wordpress.com/2020/06/69018329084.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 13232 bytes
SHA-256: b19c96f819edd920ba4f109c7d2ebc0e1841a51ef6c48b7657fb905e6319cb4c
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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