Malicious PDF — malware analysis report

Static analysis result for SHA-256 3586f582bd2424a0…

MALICIOUS

PDF

30.9 KB Created: 2020-06-06 09:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d00ea2e567ad2eb3f03f35bb27792ba6 SHA-1: 5e663357d982d7459b341d84d8c8d834005f1846 SHA-256: 3586f582bd2424a0149f881df558e3eaf4d9eb918383697b68de8787ba68633b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, with a significant number pointing to the '2f.undesirable.us' domain, indicating a link farm or redirection strategy. The document body, though partially corrupted, suggests a lure related to a physics worksheet. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports a malicious intent to redirect users to potentially harmful content.

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://oralkami.com/uploads/1/3/0/2/130271137/130271137.html#distance+and+displacement+physics+worksheet
    • http://2f.undesirable.us/uploads/1/3/1/0/131070476/talatur_ronovawubifo.pdf
    • http://alraiq.net/uploads/1/3/0/6/130620565/1bc18be609576b.pdf
    • http://sdhomeinsurance.com/uploads/1/3/0/9/130969712/wowanumowupa_gitanetos.pdf
    • http://oralkami.com/uploads/1/3/0/2/130271137/terms.html
    • http://oralkami.com/uploads/1/3/0/2/130271137/dmca.html
    • http://oralkami.com/uploads/1/3/0/2/130271137/policy.html
    • https://jogevedujip.files.wordpress.com/2020/06/95204793113.pdf
    • https://pujobat.files.wordpress.com/2020/06/55251739973.pdf
    • https://xalofupoz.files.wordpress.com/2020/06/nabigevuzajoxonegotirewe.pdf
    • https://fapodafa.files.wordpress.com/2020/06/lugadutov.pdf
    • https://kagapub.files.wordpress.com/2020/06/69035761458.pdf
    • https://sodovele.files.wordpress.com/2020/06/70281708656.pdf
    • https://rugitub.files.wordpress.com/2020/06/31613860975.pdf
    • https://gamuzebu.files.wordpress.com/2020/06/91737847959.pdf
    • https://mirexudokof.files.wordpress.com/2020/06/46591872802.pdf
    • https://xilogip.files.wordpress.com/2020/06/tifusemedarusuluko.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_off000050c1.bin
5f013fd174e9aa75811206e53a2fe46a5d42848909140615467d4c1cbd20a127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C1 9176 bytes

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