Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a3aaaee5c8c4f9…

MALICIOUS

PDF

39.2 KB Created: 2020-04-06 06:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1300b4c21cc2c1f9419ee1e959b290d6 SHA-1: 08823e1f474454f627198cf78170e2098862b03b SHA-256: 24a3aaaee5c8c4f9a2a4cd542a903acf9845b5175ea6487aaa636884aa2d752f
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, and the document body is heavily obfuscated, but the primary malicious intent appears to be the distribution of numerous external links.

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://tameingenieros.com/uploads/1/3/0/2/130287238/130287238.html#how+to+take+apart+a+winchester+model+1200
    • http://andweber.com/uploads/1/3/0/8/130813547/31950.pdf
    • http://localclickpartners.com/uploads/1/3/0/7/130740232/zozuzixuxosuma_metesibimobi.pdf
    • http://www.sweetpeaflorist.net/uploads/1/3/0/8/130874372/pebexizufo-padolakenegimog.pdf
    • http://halohort.com/uploads/1/3/0/5/130588845/ee38b69.pdf
    • http://ashleyksanchez.com/uploads/1/3/1/3/131398143/sidoxi.pdf
    • http://ellisongreyofficial.com/uploads/1/3/0/5/130588936/dugogizodifi.pdf
    • http://excellenceofelite.com/uploads/1/3/1/3/131380086/a93d2b6aab.pdf
    • http://marcialayouni.com/uploads/1/3/0/5/130588922/goliwutowonar.pdf
    • http://brooklynbiscuittortoni.com/uploads/1/3/0/6/130621587/zexowujalakemufi.pdf
    • http://magicalmomentsbymichael.com/uploads/1/3/0/6/130604173/xizirome_kusakodaw.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_off00006f2b.bin
175d3eca42f49a7e05346e0b1b3faa4ca444b0672fd9c6f24911200d3236887b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2B 7908 bytes

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