Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cb5263331d8669…

MALICIOUS

PDF

37.7 KB Created: 2020-06-08 01:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 681eb9ebb12ceafc497a06c24f631255 SHA-1: c6cd0085dd90b9171aa3fd613d487c97bdacfb27 SHA-256: 75cb5263331d8669726688868d8c99e507b64ca92db173eb3984d154e3ca4501
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, which are likely intended to redirect users to malicious websites. The document body, though heavily obfuscated, contains text suggesting a lure related to 'employer payroll taxes quizlet', indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://profeward.com/uploads/1/3/0/6/130640125/130640125.html#employer+payroll+taxes+quizlet
    • http://hostmaster.animalhearts.net/uploads/1/3/0/9/130969459/61906a36cf1.pdf
    • http://wildfaithherbalwellness.com/uploads/1/3/0/6/130639428/1a598ded56fc.pdf
    • http://mta-sts.mail.sdmwoodworkings.com/uploads/1/3/0/8/130874066/03a33137.pdf
    • http://3h.undesirable.us/uploads/1/3/0/6/130621831/06ad0dc9.pdf
    • http://gotttex.net/uploads/1/3/0/3/130313529/9985988.pdf
    • http://hostmaster.whiterosemarathons.co.uk/uploads/1/3/0/2/130271206/cdc3efdf68.pdf
    • http://zweemie.com/uploads/1/3/0/5/130538875/6c6dce1.pdf
    • http://southatlanticbridgingco.com/uploads/1/3/1/3/131380342/pisud.pdf
    • http://groismantm.com/uploads/1/3/0/7/130775806/ccbf7b30.pdf
    • http://hashcab.net/uploads/1/3/0/7/130738752/b337860c6.pdf
    • http://michaelrosebaby.com/uploads/1/3/1/3/131380390/wuxoxegonovodejevoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://naxopovo.files.wordpress.com/2020/06/20986514390.pdf
    • https://zutomipiwaw.files.wordpress.com/2020/06/22004440123.pdf
    • https://kiwuzuk.files.wordpress.com/2020/06/4144729991.pdf
    • https://zuzilunox.files.wordpress.com/2020/06/zozexa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b7.bin
1e549ff6e124972f643639894e651dcc7741918c9211b2a33b0b30a3d9fa6b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B7 10780 bytes

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