Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b556540dec52ab9…

MALICIOUS

PDF

46.9 KB Created: 2020-03-29 14:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2bf0792945144826d64fd27e517d3efa SHA-1: 55a01e3586406e34a8042e18c0ca3dacb43ea02d SHA-256: 5b556540dec52ab9ccc6ba9a8e1b27cb175a052bf341a03c13e74e0cd06983a5
136 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDFs. The document body text, though partially corrupted, includes a URL that appears to be a lure related to a medical query. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host a large number of malicious payloads. The ML classifier strongly suggests malicious intent.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mta-sts.mx.grandsalinelibrary.com/uploads/1/3/0/6/130621488/130621488.html#que+especialista+trata+los+hongos+en+las+u%C3%B1as+de+los+pies
    • http://evolvingtogether2019.com/uploads/1/3/0/5/130551416/ac7fd50.pdf
    • http://frostedbyfletch.com/uploads/1/3/0/6/130639439/c5a9af.pdf
    • http://crownfirearms.com/uploads/1/3/0/6/130639538/nelisew_xavinaj_diwarid.pdf
    • http://acomputerconsultant.com/uploads/1/3/0/5/130551739/xetoluloladuzeja.pdf
    • http://umoja-cambodia.org/uploads/1/3/0/7/130738647/864ccfb146351.pdf
    • http://marriagecelebranthilaryvaneldik.com/uploads/1/3/0/2/130271060/7061110.pdf
    • http://josephnjames.com/uploads/1/3/0/2/130287929/jikejovaxed.pdf
    • http://ignoramiacapital.com/uploads/1/3/0/5/130588905/915e7acbcc25.pdf
    • http://fitmortgage4u.com/uploads/1/3/0/6/130639472/da26859f462c36.pdf
    • http://homeorganizersnyc.com/uploads/1/3/0/3/130323092/b6fcc52e39c3.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_off00008c29.bin
77b6eee6ac2d86d0ad704661fbf07a65c255eeaec1eb3bfe3d690245814d1006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C29 8776 bytes

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