Malicious PDF — malware analysis report

Static analysis result for SHA-256 608072cd322d9858…

MALICIOUS

PDF

52.2 KB Created: 2020-04-06 13:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 879c43b52b1ed0815fead46fd82c5dc2 SHA-1: 28aae5cd0d5210b67e59e371f92a693f84266788 SHA-256: 608072cd322d9858f9760b18942763b17ff6f9c3bcbcc14733f0ca2fb9752639
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of embedded external links, many of which point to other PDF files hosted on suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a network of linked content, likely for SEO manipulation or to distribute further malicious payloads. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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://le7emepeche.net/uploads/1/3/0/5/130551013/130551013.html#estructura+capital+de+trabajo
    • http://surfacepro6.forsale/uploads/1/3/0/5/130590654/sekipopufemupu.pdf
    • http://ishasushi.com/uploads/1/3/0/7/130775055/zoduraradibeva.pdf
    • http://taylormade4u2.com/uploads/1/3/0/4/130483978/lafosa.pdf
    • http://stltrek.com/uploads/1/3/0/7/130776101/08c176223c019.pdf
    • http://zumyum.com/uploads/1/3/0/6/130621856/jijexog.pdf
    • http://cronusordersociety.com/uploads/1/3/0/2/130289453/gaxinafube.pdf
    • http://redneckfest.org/uploads/1/3/0/6/130639491/8a8ef6c6e41e.pdf
    • http://nellycorso.com/uploads/1/3/0/7/130739101/zoluxoxokabeb_fupugave_walipexix.pdf
    • http://aureslatinamerica.com/uploads/1/3/0/6/130603809/7402462.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cf3.bin
6df8d8cae810fdc26c14fe9b4b293a90d8a7ba2bb58fc16825c9176bb56bba10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF3 9440 bytes
font_01_sfnt_off0000af25.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 16036 bytes

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