Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5720860cb23c70…

MALICIOUS

PDF

33.7 KB Created: 2020-06-03 08:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bd366440b93a8e0e21e89bb2cde0d89 SHA-1: 7bf8046e84788f99c6ee2917bd62fed78f780a4a SHA-256: 7b5720860cb23c70c19bf178fdde508fa44c10874252ebca84a263f46f98e6b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are hosted on domains associated with SEO link farms, suggesting a phishing or malicious content delivery attempt. The document body mentions 'Northwestern mutual internship interview', indicating a lure to attract victims. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF_URI and PDF_SEO_LINK_FARM heuristics further supports this assessment. 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://41z.undesirable.us/uploads/1/3/1/3/131398045/131398045.html#northwestern+mutual+internship+interview
    • http://achievewithmv.com/uploads/1/3/0/7/130738979/vakufopoguzuref.pdf
    • http://meiliphotography.com/uploads/1/3/1/4/131437677/e0f4772fd62ee3.pdf
    • http://teenaceclothing.com/uploads/1/3/0/7/130775752/3553658.pdf
    • http://acmbuenosaires.org/uploads/1/3/0/3/130324063/0cbfa.pdf
    • http://startmeuptribute.com/uploads/1/3/0/7/130740596/b2488dba31b1e86.pdf
    • http://browntmt.com/uploads/1/3/0/2/130273740/353b66af6a.pdf
    • http://41z.undesirable.us/uploads/1/3/1/3/131398045/terms.html
    • http://41z.undesirable.us/uploads/1/3/1/3/131398045/dmca.html
    • http://41z.undesirable.us/uploads/1/3/1/3/131398045/policy.html
    • https://ramisiwew.files.wordpress.com/2020/05/mimepukanunoge.pdf
    • https://kiwekesumi.files.wordpress.com/2020/06/70359045149.pdf
    • https://wevamuxugivi.files.wordpress.com/2020/05/61348676340.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_off000057dd.bin
416755f08c2df5f86c0172d707b5047999b12ae042d9403517cc1faf02181a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57DD 10388 bytes

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