Malicious PDF — malware analysis report

Static analysis result for SHA-256 318268cdc7e1737e…

MALICIOUS

PDF

45.4 KB Created: 2020-06-05 03:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a16580243184e554a977b21e8b983fc SHA-1: 01b2e6815035525242c8bac3fadb7c70621f8f28 SHA-256: 318268cdc7e1737e5ef6d76a2a722cc066e6a52e27199c21fbcc7f6dcdf47483
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially obfuscated, contains references to these external URLs. The primary function appears to be directing users to a multitude of other PDF documents hosted on various domains, suggesting a link farm or distribution mechanism for potentially malicious content.

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://gymsquad.net/uploads/1/3/0/8/130813896/130813896.html#la+escuela+de+la+ignorancia
    • http://alexpatterson.com/uploads/1/3/0/8/130813840/daxofewenalafotew.pdf
    • http://entermotorsgroupinc.com/uploads/1/3/1/3/131384279/lenag.pdf
    • http://peterneofotis.com/uploads/1/3/0/6/130604497/zozatumexa.pdf
    • http://investigatenyc.com/uploads/1/3/1/1/131163904/3715073.pdf
    • http://legrandmichael.com/uploads/1/3/0/7/130738637/dajereseto_vikagejaw_wuvuji.pdf
    • http://madeleinerosekelly.com/uploads/1/3/0/2/130288329/xeripupozupule-fokekizoxafev-wunavetofuf-fuvuko.pdf
    • http://bellaspeechsensoryworldinc.com/uploads/1/3/0/2/130289749/4ade0.pdf
    • http://mosquitosaregone.com/uploads/1/3/0/2/130289595/genumasigove.pdf
    • http://artemiseyewear.com/uploads/1/3/0/3/130379653/jitutux.pdf
    • http://itsmeaudrey.com/uploads/1/3/0/8/130874393/jazojolapisigej-luwegizuguliwal-rabanegewamu.pdf
    • http://webdisk.wildebeer.co.za/uploads/1/3/0/7/130739970/gaguf_baganibo_vufilofazafego_sovev.pdf
    • http://1infinity1.com/uploads/1/3/0/7/130738652/jejutu.pdf
    • http://gymsquad.net/uploads/1/3/0/8/130813896/terms.html
    • http://gymsquad.net/uploads/1/3/0/8/130813896/dmca.html
    • http://gymsquad.net/uploads/1/3/0/8/130813896/policy.html
    • https://rojegud.files.wordpress.com/2020/06/40396660223.pdf
    • https://jomosuwedel.files.wordpress.com/2020/06/gudur.pdf
    • https://butisukumig.files.wordpress.com/2020/06/54910409777.pdf
    • https://lelapan.files.wordpress.com/2020/06/45314484520.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_off00007765.bin
ecc7aec959d9aef947575c0f726263cca548e1ad011cc352fe996f47f18c4e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 15932 bytes