Malicious PDF — malware analysis report

Static analysis result for SHA-256 740bb5ee5d05e9fe…

MALICIOUS

PDF

36.4 KB Created: 2020-04-15 10:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 59c5cec12b370336fa8abf9fe0b9d410 SHA-1: 3b219f06d4e7e889b995e8dbb356bf296dbabb1c SHA-256: 740bb5ee5d05e9fe91114d0eeefcfcb5094058b888ed1bdee755c3685a0a705d
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as PDF files with numeric slugs, suggesting a link farm designed to host malicious content. The document body, though heavily obfuscated, contains text related to an 'appraisal form template excel' and a URL pointing to a similar resource, indicating a lure to direct users to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://66denham.com/uploads/1/3/0/8/130874518/130874518.html#appraisal+form+template+excel
    • http://my-self-care.com/uploads/1/3/0/5/130551248/pasuxasume.pdf
    • http://anna-yshin.com/uploads/1/3/0/6/130604919/8667913.pdf
    • http://ayvarosecosmetics.com/uploads/1/3/0/8/130873826/cf582e942e.pdf
    • http://amyguerra.com/uploads/1/3/1/4/131452804/ratekal.pdf
    • http://thebeauxandarrow.com/uploads/1/3/0/4/130436108/1776470.pdf
    • http://fpapremier.com/uploads/1/3/0/5/130589125/4993445.pdf
    • http://dropshiponlinenow.com/uploads/1/3/0/3/130323491/d6e3b9ff8a.pdf
    • http://brokerboots.com/uploads/1/3/1/3/131383933/pawotubif_mamiraragos_totipezex.pdf
    • http://bigjimsbonding.com/uploads/1/3/0/9/130969761/wiwevuzevesuj_tafadonisu.pdf
    • http://franklinusja.org/uploads/1/3/0/9/130969498/8139920.pdf
    • http://electdickiebraswell.com/uploads/1/3/0/6/130640040/vejerup.pdf
    • http://allin1renovations.com/uploads/1/3/1/6/131606638/kubesabobo.pdf
    • http://lincolnspencer.info/uploads/1/3/0/7/130739987/sebebit.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_off00006780.bin
f24aa6aa1b24f9e341ca22669a8a143c77f88e87a56bb74920a99e7ccb87c7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6780 7796 bytes

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