Malicious PDF — malware analysis report

Static analysis result for SHA-256 083338227d4cb587…

MALICIOUS

PDF

37.8 KB Created: 2020-03-21 18:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a57e78a4075d7aeb6b74c1ace9011e8a SHA-1: 59c1d0671f76b8a60a1d647b858e21f4467d578b SHA-256: 083338227d4cb587efbb68099900d17662eda83467652a644d208b1b5cc0a046
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external URLs, identified as a link farm by heuristic analysis. The document body, though partially corrupted, contains one of these URLs, suggesting the primary purpose is to redirect users to malicious content hosted on external sites. The ML classifier strongly indicated maliciousness, supporting the link farm attack pattern.

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://asetsha.net/uploads/1/3/0/4/130476981/130476981.html#que+es+espacio+geogr%C3%A1fico+natural
    • http://oriolfinancial.com/uploads/1/3/0/8/130874540/sisitaluja-vebik-tigodajoriredev.pdf
    • http://www.healthylyfestyleliving.com/uploads/1/3/0/2/130270938/913a094a.pdf
    • http://ibandmanagerpro.com/uploads/1/3/0/7/130738762/6581912.pdf
    • http://www.fleurdorange.net/uploads/1/3/0/5/130588286/dudewemejima.pdf
    • http://www.southardcharm.shop/uploads/1/3/0/6/130622089/1118451.pdf
    • http://brandingpowertools.com/uploads/1/3/0/3/130323186/3215760.pdf
    • http://deenastrategies.com/uploads/1/3/0/5/130539825/raduso.pdf
    • http://myadventuresandlifeonflm.com/uploads/1/3/0/7/130776533/rasujubimofuzazamu.pdf
    • http://reneedumarr.com/uploads/1/3/0/7/130776253/1db4b38c3c2.pdf
    • http://printspirations.com/uploads/1/3/0/2/130291699/maweta.pdf
    • http://shudit.club/uploads/1/3/0/2/130270845/7249907.pdf
    • http://www.investorsman.com/uploads/1/3/0/5/130588288/1858551.pdf
    • http://novascotiawind.com/uploads/1/3/0/4/130488691/6145566.pdf
    • http://webmail.thogersenfamilyfarm.com/uploads/1/3/0/8/130874676/mofefemadujuv_lelituf.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_off00006797.bin
1e45b8fdb94f96d3e4a722a610277fb29e563a726e8176fde8b927b8f96eb3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6797 9024 bytes

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