Malicious PDF — malware analysis report

Static analysis result for SHA-256 4289bcc3565d0e13…

MALICIOUS

PDF

51.0 KB Created: 2020-03-29 14:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce52d34cc9b45f1e2db072c4b6095d73 SHA-1: b8f67783774acb1f269688e7a9e2c8ea9af34c28 SHA-256: 4289bcc3565d0e13e3c3449a8c7a5f23f8fbae9209c5a1774da29400708ad7b2
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains. This behavior is characteristic of SEO spam or a link farm, designed to drive traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

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://74-123-77-82.mgwnet.com/uploads/1/3/0/9/130969407/130969407.html#grimgar+of+fantasy+and+ash+light+novel+volume+13
    • http://professorsandcraftsmen.com/uploads/1/3/0/6/130639073/6d7ca68155094.pdf
    • http://gainstorming.org/uploads/1/3/0/5/130588633/zuluwafelewom_zulado_kogiduxopebe.pdf
    • http://dngraphicshawaii.com/uploads/1/3/0/8/130874018/dokiletonitag-jomelokagagar-vigufa-kiwewufedegefig.pdf
    • http://akcustomart.com/uploads/1/3/0/2/130291800/cc41d.pdf
    • http://djlakrao.com/uploads/1/3/0/6/130604799/545cf21.pdf
    • http://bearsswimschool.com/uploads/1/3/0/4/130488565/5880886.pdf
    • http://primesystemstech.com/uploads/1/3/0/7/130740517/wepopoge.pdf
    • http://moodstylehaus.com/uploads/1/3/1/4/131410094/dixuzepobole.pdf
    • http://atticusai.com/uploads/1/3/0/6/130621296/2397318.pdf
    • http://publi4.net/uploads/1/3/0/7/130775510/mimoju-jobadafitu-zatufetetatade.pdf
    • http://road2raw.com/uploads/1/3/0/7/130739474/vevezimizegoziladoso.pdf
    • http://crablefoundation.org/uploads/1/3/0/6/130639977/8226611.pdf
    • http://churchesformentalhealth.com/uploads/1/3/0/5/130590157/vuvede.pdf
    • http://simplyirresistabledelights.com/uploads/1/3/0/4/130477719/penoximolejego.pdf
    • http://med-impulse.ru/uploads/1/3/0/5/130551342/7668833.pdf
    • http://empower-the-youth.org/uploads/1/3/0/2/130287488/3708dae7df48ee.pdf
    • http://pyktures.com/uploads/1/3/0/6/130639603/gedila_futiziwa.pdf
    • http://www.alchemy-unlimited.com/uploads/1/3/0/3/130323762/d6594b9f73d8.pdf
    • http://castlemender.net/uploads/1/3/1/0/131071127/8977c898552.pdf
    • http://planotimesavers.com/uploads/1/3/0/3/130313398/kunekowa.pdf
    • http://michelledrumheller.com/uploads/1/3/0/7/130776760/8831035.pdf
    • http://centralvalleywomensexpo.com/uploads/1/3/0/7/130775635/wedirinasexomaz.pdf
    • http://suigenerismama.com/uploads/1/3/0/6/130639477/c67dd3.pdf
    • http://socialtinga.com/uploads/1/3/0/5/130551006/7539777.pdf
    • http://socialtinga.com/u
    • 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_off00008281.bin
d763baa3bc3f1f89971f17691075fe7acb92a13cc6a5c0cf6163b5ccadf8031d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8281 8460 bytes
font_01_sfnt_off0000a30a.bin
44dc20ff77d142357bccde4f210bc30c83a7bd6b74d0efa7111b5c6287c6ccf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA30A 8168 bytes

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