Malicious PDF — malware analysis report

Static analysis result for SHA-256 161b2ae15e7e3540…

MALICIOUS

PDF

37.0 KB Created: 2020-03-29 21:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: abe1ec49f2a2ecc3a760a4b4fdb0431e SHA-1: d7c98614afb0a21b88d69c63731d7d8b748f36e7 SHA-256: 161b2ae15e7e3540e8777c7f2cf6b89f07056ca7a29f60a9242b629746704c3a
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The embedded document body contains obfuscated text and URLs, indicating an attempt to redirect users to potentially harmful content. No scripts were extracted, but the extensive use of external links points towards a distribution or redirection mechanism.

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://gomriz.com/uploads/1/3/0/5/130590368/130590368.html#anatomia+vascular+miembro+inferior+pdf
    • http://iuseelite.net/uploads/1/3/0/6/130605179/fakipifomi.pdf
    • http://mabuhaylove.com/uploads/1/3/0/4/130478470/tujaji.pdf
    • http://vozcultura.com/uploads/1/3/0/4/130488920/rixuse_jimowujiduxoxu_nowadaxen_lemegisenun.pdf
    • http://lorenzomasnah.com/uploads/1/3/0/7/130776883/6053332.pdf
    • http://minedearth.com/uploads/1/3/0/7/130739704/62b9711f113589.pdf
    • http://managerlog.us/uploads/1/3/0/8/130814591/eb76eb2b11a.pdf
    • http://rjfitnessokc.com/uploads/1/3/0/5/130543685/risupupimi-xunikonogobo-lileganibokuzuj.pdf
    • http://islamicbankingblog.net/uploads/1/3/0/8/130814133/4765878.pdf
    • http://polishdoc.com/uploads/1/3/0/8/130813781/40765bd.pdf
    • http://carsonalliance.com/uploads/1/3/0/5/130588482/panofi.pdf
    • http://intelligenthospital.com/uploads/1/3/0/9/130969169/divebewewujalo_nofewipufop_weruke.pdf
    • http://katrinaconnolly.com/uploads/1/3/0/9/130969358/bunodifusufawu.pdf
    • http://acquiredhospitalitygroupinc.com/uploads/1/3/0/8/130874011/3779277.pdf
    • http://kingstontowingservice.ca/uploads/1/3/0/7/130775542/zawivubugumej_bazigitixine_zasejo.pdf
    • http://chloecurtisxo88.com/uploads/1/3/0/5/130589310/2627559.pdf
    • http://rabbettstrickland.com/uploads/1/3/0/6/130604458/ce9067.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_off00006a0e.bin
794b5e560371f2f75122e5ae1d89531f59fa3921c3646a08b14082b38d08c94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0E 7788 bytes

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