Malicious PDF — malware analysis report

Static analysis result for SHA-256 724591ff3675f887…

MALICIOUS

PDF

65.3 KB Created: 2020-04-01 15:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9c6bacde4517ec8b6eaa70893fabdc50 SHA-1: 73ef39935b878827e4784956853d54abdf6c85b3 SHA-256: 724591ff3675f887af4a07b749ca2da9f3c3e4f6cbba21375fe88911b23ef6f4
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, suggesting a link farm or redirection scheme. The document body, though partially obfuscated, mentions a diet and includes a URL that appears to be part of this scheme. The presence of numerous external PDF links and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious content or phishing sites.

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://axedtimberproducts.com/uploads/1/3/0/9/130969974/130969974.html#dieta+normal+o+basal+alimentos+permitidos
    • http://webdisk.collegedemsatiu.com/uploads/1/3/0/5/130540868/3242a89c90a6f.pdf
    • http://hostmaster.banyantree21.com/uploads/1/3/0/5/130540814/910a7.pdf
    • http://hilltopconstruction.net/uploads/1/3/0/8/130814596/tuwupeg.pdf
    • http://gilesphilip.com/uploads/1/3/0/4/130476910/19e969c.pdf
    • http://learningstem.info/uploads/1/3/1/4/131453558/ee10a9b1.pdf
    • http://antebellumrp2k19.com/uploads/1/3/1/4/131406607/newitep.pdf
    • http://ethicalorganicbiz.com/uploads/1/3/0/4/130488470/3671035.pdf
    • http://nickskitchendalycity.com/uploads/1/3/0/3/130323633/57175f648.pdf
    • http://kireiyuri.com/uploads/1/3/0/2/130289519/4e3f0a.pdf
    • http://superiortrusses.net/uploads/1/3/1/3/131379163/vurirujapetaj-nimasizemutok-mexulasojusulu-zarularolerolis.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_off0000d219.bin
347c7a1a2b49ae7ea8e074ddffb0bbcd4ca78b2622f83831d821b62cb48e2f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 10332 bytes

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