Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f83ee7334a94efd…

MALICIOUS

PDF

54.9 KB Created: 2020-03-15 08:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b660d10000e145211979fd889b06cbb8 SHA-1: e54d96a6ebe7e993b86e018451944ec69608bf66 SHA-256: 5f83ee7334a94efd2c52cbfa34a03f1ee15d2f8fc1db9d8fc2b87266c9f9d089
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious or deceptive content, possibly as part of a phishing or spam campaign.

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://kingshotelsmunichcitystay.devsite-1.com/uploads/1/3/0/5/130541065/130541065.html#lucifer+box+office+collection+report+imdb
    • http://ninety-percent.com/uploads/1/3/0/5/130590531/e510a7f.pdf
    • http://boyscoutpopcorn.online/uploads/1/3/0/7/130740174/gixudipuzoweb.pdf
    • http://webdisk.cleansheetsmfg.com/uploads/1/3/0/7/130775507/fopazibi_purusegutiv.pdf
    • http://seasonofpets.com/uploads/1/3/0/5/130588816/1795866.pdf
    • http://josemiguelmoral.com/uploads/1/3/0/3/130379298/fd605e8339ae3.pdf
    • http://teamdog.ie/uploads/1/3/0/2/130272360/cf294.pdf
    • http://mail.aemonitoring.com/uploads/1/3/0/4/130483322/xetasigifaso_konajesozosibak.pdf
    • http://www.rtvidole.com/uploads/1/3/0/2/130270966/7518902.pdf
    • http://74-123-76-197.mgwnet.com/uploads/1/3/0/3/130313613/wunuxiki.pdf
    • http://streamboxtv.com/uploads/1/3/0/7/130738528/1715965.pdf
    • http://parapety-kanclerz.pl/uploads/1/3/0/7/130739154/febfbff85609.pdf
    • http://andersonmasonrysupply.com/uploads/1/3/0/2/130273762/1844497.pdf
    • http://hostmaster.ban-thung-lakon-school.life/uploads/1/3/0/8/130814469/sodikutefe.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a426.bin
5a5bfce6b604a7cea3214d59a70a209a3bf72edfd17754659236cf93615fc893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA426 7960 bytes
font_01_sfnt_off0000c32d.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC32D 2616 bytes

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