Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2b9b6737992952…

MALICIOUS

PDF

39.5 KB Created: 2020-06-05 04:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c1904118f08636ade1fb8c6dc8b5b1 SHA-1: d657debf5cc40a3f1e29ee544dd274c1efd7aff2 SHA-256: 3e2b9b673799295274adba17442b9b721aec15d0e590034cf18ba57c893e576c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious PDF

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO spamming activity, potentially leading users to malicious content or phishing sites.

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://ie.undesirable.us/uploads/1/3/1/4/131408546/131408546.html#found+input+variables+with+inconsistent+numbers+of+samples
    • http://vps2-internal.pleasingfood.com/uploads/1/3/0/4/130488445/4842435.pdf
    • http://findcars.fr/uploads/1/3/0/5/130588357/7353111.pdf
    • http://webdisk.wisewomenofblaircounty.org/uploads/1/3/0/8/130815437/3986341.pdf
    • http://exoticsugar.net/uploads/1/3/0/6/130621780/gaduladipa.pdf
    • http://ie.undesirable.us/uploads/1/3/1/4/131408546/terms.html
    • http://ie.undesirable.us/uploads/1/3/1/4/131408546/dmca.html
    • http://ie.undesirable.us/uploads/1/3/1/4/131408546/policy.html
    • http://chicagolive.nm.org/uploads/1/3/0/8/130873918/b32d22042ad5104.pdf
    • https://zizusexa.files.wordpress.com/2020/06/37818618052.pdf
    • https://zigivol.files.wordpress.com/2020/06/85281507262.pdf
    • https://zubugoko.files.wordpress.com/2020/06/fewekimalonepov.pdf
    • https://likapimaxex450450250.files.wordpress.com/2020/06/87445961623.pdf
    • https://mofebim.files.wordpress.com/2020/06/37998181974.pdf
    • https://lewewijib.files.wordpress.com/2020/06/41006549098.pdf
    • https://jutaburo.files.wordpress.com/2020/06/luvesifufe.pdf
    • https://dunemekuw.files.wordpress.com/2020/06/20710341643.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_off00006a57.bin
4978606e9e75ce7f575996bcab7b93b7482d18c1a73240d4cdc58210bc60f42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A57 12056 bytes

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