Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa602fc4e2007f9…

MALICIOUS

PDF

42.5 KB Created: 2020-05-07 03:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6576590586694a1b748161338363ecd SHA-1: d9d8a4bd3b45a21f4e76f8506d42d69226d925b5 SHA-256: 5fa602fc4e2007f92ef4719cc0a9054a1391ed357b7f2f448f6d5d0c705b3628
136 Risk Score

Malware Insights

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

This PDF document is designed to appear as an educational worksheet, but it contains a large number of links to external PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous algorithmically generated URLs further supports a malicious intent, possibly to download further stages or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drobgyn.net/uploads/1/3/0/7/130775590/130775590.html#practice+worksheet+on+articles+for+grade+5
    • http://charlisinessatoriconsulting.org/uploads/1/3/1/4/131452883/7fc562b6bb.pdf
    • http://sustainableconceptsdevelopment.com/uploads/1/3/0/5/130590541/9713347.pdf
    • http://vonshartzer.com/uploads/1/3/0/4/130483299/sotutewe.pdf
    • http://lfplasteringcontractors.com/uploads/1/3/0/7/130740298/2456115.pdf
    • http://sympathyflowersvictoria.com/uploads/1/3/1/3/131379824/9674834.pdf
    • http://jpmobility.com/uploads/1/3/0/6/130621980/mexujikebefekiwo.pdf
    • http://smithandcoservices.co/uploads/1/3/1/4/131483112/b4af185a5c1b67.pdf
    • http://elevationquilts.com/uploads/1/3/1/4/131438509/5727207.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00007a01.bin
2f32351f1be89f5935fefff44c8b7468803e0d4f783688d5b792f229279e2d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A01 11100 bytes

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