Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f38236cf5eb641…

MALICIOUS

PDF

48.4 KB Created: 2020-04-05 15:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9d7d69b90360799e24b6b111552eb23e SHA-1: 521ef6f0ffcfe16f94ef3a48412b89a04e36ba15 SHA-256: 70f38236cf5eb641265003046bec3980066bdb206444816bdce4249b6aad1142
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it was generated by wkhtmltopdf, which can be abused to create such link farms. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent to direct users to potentially harmful 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://mysoulfulmind.com/uploads/1/3/0/6/130621305/130621305.html#shin+highschool+dxd+volume+1+download
    • http://mtsarmusic.com/uploads/1/3/0/4/130489228/dexumolabilave-nivesato.pdf
    • http://elimochel.com/uploads/1/3/0/7/130775782/rodusexiv-sanuwupozavof-vebubiweduxe.pdf
    • http://relief-at-hand.com/uploads/1/3/0/4/130483253/tojavigebide-bilabin-pedenikafedari.pdf
    • http://excellentbusinesstools.com/uploads/1/3/0/2/130289371/69ff06a6d7df52.pdf
    • http://careforbody.net/uploads/1/3/0/8/130813132/vewomovuzi.pdf
    • http://prestigepayeeservices.org/uploads/1/3/0/9/130969366/3979315.pdf
    • http://tomtopal.com/uploads/1/3/0/5/130539846/48746f0223.pdf
    • http://colorguardlove.com/uploads/1/3/1/1/131164278/4bbdadf9.pdf
    • http://elevacio.com/uploads/1/3/0/9/130969985/5524455.pdf
    • http://auspoolsandspas.com/uploads/1/3/1/3/131380870/lisulak-rababega-vuwiveg.pdf
    • http://abundancebirthright.com/uploads/1/3/0/4/130488493/1556482.pdf
    • http://southerngirlcoffee.com/uploads/1/3/0/5/130551429/91b641792c557.pdf
    • http://gacimba.com/uploads/1/3/0/8/130813496/e207f17c105.pdf
    • http://colorado-animation.com/uploads/1/3/0/7/130740573/28f55b9fa.pdf
    • http://mideastmission.org/uploads/1/3/0/5/130588718/49ec40c6d16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e48.bin
8b032eccf04bdbb1d954fed3bcc42cf3311622d4638b80cbd846598f15e12370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E48 8656 bytes
font_01_sfnt_off00008f0a.bin
7ef2abf0566892561f2570e94f1670979a30157d01d491c140f061ae5ee1ad1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0A 2908 bytes
font_02_sfnt_off000098fc.bin
d12117e3348e3b4ae4740355b28dcc06ae22088ff60b82320425652cfad62f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98FC 7672 bytes

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