Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bb34992a5c2da0…

MALICIOUS

PDF

35.7 KB Created: 2020-05-22 15:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4496e61b1530c7d4fe196c28df62865 SHA-1: 70a44750b9eba8eea4a761f4cd4876c497f1e583 SHA-256: 17bb34992a5c2da058b766e44e50cd318225e47109b79cc5f8e281957b2ca1d0
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are algorithmically generated and point to SEO-spam-like URLs. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, while heavily obfuscated, contains some of these URLs, suggesting the document's primary purpose is to redirect users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://74-123-79-220.mgwnet.com/uploads/1/3/0/6/130621744/130621744.html#alcatel+a3+10+4g+lte+android+tablet
    • http://chilliwackrespitecare.com/uploads/1/3/1/0/131070652/9993314.pdf
    • http://makebrarian.com/uploads/1/3/0/2/130287527/3646270.pdf
    • http://alphaomegadetailing.net/uploads/1/3/0/2/130289272/wipatuxufir_newuwo_setajawa.pdf
    • http://chevroletsilverado2005ss.com/uploads/1/3/1/3/131380470/0c2e20d09353.pdf
    • http://analyticalinstrumentservicecompany.com/uploads/1/3/0/7/130738732/wopedojetitami_fenidukoserexif_jamumifaxo.pdf
    • http://thepowerofzen.com/uploads/1/3/1/4/131408203/6f778.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/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_off00005e48.bin
8fb9b9053d24163d43a37e3e925f325cdfb984c120330c69f68dcecbf436a7c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E48 11224 bytes

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