Malicious PDF — malware analysis report

Static analysis result for SHA-256 016bd652afd802cf…

MALICIOUS

PDF

35.8 KB Created: 2020-04-28 17:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4241fb12edb8f07514316d31af01a314 SHA-1: 88570c099db25c5ded327576683557342b8b6af7 SHA-256: 016bd652afd802cff9169ebea69dcc1211c7c45f35f751a499147b76d161bb48
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting the primary purpose is to redirect users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://barrusmemorialrace.com/uploads/1/3/1/4/131453950/131453950.html#lesson+1.+4+inverses+of+functions+answers
    • http://spirious.com/uploads/1/3/0/6/130620986/laseje_jogabixapaj_mukujuxinegak_wikofij.pdf
    • http://beingtrulyyou.com/uploads/1/3/0/4/130483299/dugomukuw.pdf
    • http://restoresd.org/uploads/1/3/0/5/130588444/jirolamex.pdf
    • http://richfitpro.com/uploads/1/3/1/4/131455328/dabatuvidi.pdf
    • http://commonthreadsquiltguild.net/uploads/1/3/1/3/131379919/e14cc92d29.pdf
    • http://aandkbeauty.com/uploads/1/3/0/2/130292104/9099965.pdf
    • http://zachmazza.com/uploads/1/3/0/7/130775497/jafuzewopuriwevusul.pdf
    • http://zahrabakhsh.com/uploads/1/3/1/0/131070240/1204464.pdf
    • http://rk-is.com/uploads/1/3/0/4/130477490/wirawuzexun.pdf
    • http://jepromos.com/uploads/1/3/1/3/131379636/622be12e8.pdf
    • http://audreyhiggins.com/uploads/1/3/0/6/130639294/zuzenipero-gofox-vifinilemurize-leneba.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_off00006245.bin
e9812523f8ac47e5b2e8579de8d3f2d13b6e32ea5472e2cc50185c14201cff9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 8020 bytes

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