Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ebee2a8bf97ec6…

MALICIOUS

PDF

40.0 KB Created: 2020-04-13 09:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38d0fd2ee8acaae377038225b9d0507b SHA-1: 36cfe0b5a7ecfe39ac1f3e42702c863831edcf43 SHA-256: d3ebee2a8bf97ec6d3b9b4c03e02d4c8c065c2c0b06913305e90306a71c105d0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to 'financial markets' and appears to be generated by wkhtmltopdf, a tool often used to create PDFs from web content. The primary intent appears to be directing users to a network of potentially malicious or spam-related websites.

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://servicefran.com/uploads/1/3/1/4/131453174/131453174.html#financial+markets+word+whizzle
    • http://surfsidecollies.com/uploads/1/3/0/5/130590208/81960.pdf
    • http://90day-fitplan.com/uploads/1/3/1/6/131606490/poriz_lofujosaduzive_wefuf.pdf
    • http://goldenboxminecraft.com/uploads/1/3/1/4/131437143/1c4fc0.pdf
    • http://couleepops.com/uploads/1/3/0/2/130291492/nizapuwesewo.pdf
    • http://irishgirlphotos.com/uploads/1/3/0/5/130588988/gilowaritunetaw-nalixe-zobageluwuguna.pdf
    • http://kdmorano.com/uploads/1/3/1/4/131437079/1661127.pdf
    • http://purgatoirevalleyfoundation.org/uploads/1/3/1/4/131437333/sisit_merolix_dowemawi_kodapavogazab.pdf
    • http://evangottesman.com/uploads/1/3/0/2/130287813/0cc75ead9.pdf
    • http://newyorkhomeclick.com/uploads/1/3/1/3/131383681/bavupogunar_taloga_somufa_kogiwozulasami.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d81.bin
1240130545caa59bcc15c5c79b225a1554732edc18d49e895b9ea5f05c767209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D81 8516 bytes
font_01_sfnt_off00007e4b.bin
da097a8c459adbfdf1b1d97412e41569b305acf822c6e113ff3e46e38a168572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4B 16224 bytes

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