Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61599b5c7e422b8…

MALICIOUS

PDF

30.4 KB Created: 2020-05-13 07:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c55daf95ad9d24f3732a4b9b1d85ae6 SHA-1: 60da4e38ba25fc1d30500c9b5b9702848e81b82a SHA-256: d61599b5c7e422b823fff2cb5f93af7656d58e40e895da3571d847e4f55960d6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are hosted on newly registered domains and appear to be part of a link farm. The document body, though obfuscated, contains text related to an 'endocrine system review sheet answers' and includes several URLs. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The primary attack pattern involves luring the user to click on these external links, likely leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bsa-sccc-pack301.com/uploads/1/3/0/8/130814360/130814360.html#endocrine+system+review+sheet+answers
    • http://jljohnsonproperties.com/uploads/1/3/0/6/130620982/wexet.pdf
    • http://arsoasalon.net/uploads/1/3/0/6/130604657/rokebaweko.pdf
    • http://cridi.org/uploads/1/3/1/4/131482997/0f351d95.pdf
    • http://cierraprideart.com/uploads/1/3/0/5/130539113/serufopuz_tozepozevuta_vinug_fazaten.pdf
    • http://alaynestrategies.com/uploads/1/3/1/4/131408572/gulexubur-favug-rirebasi.pdf
    • http://actuallycoppingshoes.com/uploads/1/3/0/4/130483270/sotel.pdf
    • http://donaldginc.com/uploads/1/3/0/7/130739113/pimunin_zigideto.pdf
    • http://lsxperts.com/uploads/1/3/1/3/131384436/dupuzi.pdf
    • http://legitedit.com/uploads/1/3/0/5/130551013/479831846250a4.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_off00004c47.bin
7fd4fd9db33b8e148769296b2fcc251f54bd6354966d64aad731d84effbc668f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C47 10152 bytes

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