Malicious PDF — malware analysis report

Static analysis result for SHA-256 784b2ed7033cf9b1…

MALICIOUS

PDF

32.8 KB Created: 2020-06-06 05:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fea5a6cf6ec274a820ec18a1c8f75b9c SHA-1: 626b7e3623daddb7d4520e521973ab518a22dd29 SHA-256: 784b2ed7033cf9b19dcb3ba6f0182ebc226d0220d5058c3ab6f77ad17931ed1d
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains a large number of embedded external links, many of which point to suspicious domains. The PDF_SEO_LINK_FARM heuristic indicates a potential link farm, suggesting the document is designed to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a malicious intent to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ricanapr.com/uploads/1/3/1/6/131606268/131606268.html#utilitech+outdoor+timer+instructions+tm1627l
    • http://mta-sts.mx.pooprescues.com/uploads/1/3/0/6/130603894/2668841.pdf
    • http://agrotechcam.com/uploads/1/3/0/2/130271095/6492615.pdf
    • http://vancoproperties.org/uploads/1/3/0/7/130776104/gasepedav-madevalofi.pdf
    • http://ricanapr.com/uploads/1/3/1/6/131606268/terms.html
    • http://ricanapr.com/uploads/1/3/1/6/131606268/dmca.html
    • http://ricanapr.com/uploads/1/3/1/6/131606268/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://terabof.files.wordpress.com/2020/06/27640131896.pdf
    • https://jidibabeja.files.wordpress.com/2020/06/xegodobaxal.pdf
    • https://zaxasomumu873869530.files.wordpress.com/2020/06/pasowimizovopinatosota.pdf
    • https://zuzujosu.files.wordpress.com/2020/06/gelimodoxikopasezope.pdf
    • https://gogunogite.files.wordpress.com/2020/06/famimefelowureluludow.pdf
    • https://risisizokude.files.wordpress.com/2020/06/78850705648.pdf
    • https://jinotazataga.files.wordpress.com/2020/06/61816201194.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_off000053a8.bin
de635f1a04e10da803f43f7559e0a0d261e675cbffd56dbd02dadcfb5fe42e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A8 10752 bytes

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