Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e7b9d889120030…

MALICIOUS

PDF

38.4 KB Created: 2020-04-04 06:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb119dc43c4b27c1c3ec1503bf83884d SHA-1: 440961a1f5595a6110e5d1ad13257c4d1bdefba8 SHA-256: a7e7b9d889120030d588f3ca2cd2b61e86d047937a4a2b3849d624e14c42881c
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used to distribute malware or redirect users to phishing sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, suggesting a coordinated effort to host malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the extensive link farm is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://austinfenn.com/uploads/1/3/0/4/130435821/130435821.html#convert+1+kcal%2Fkg+to+btu%2Flb
    • http://mosaicci.com/uploads/1/3/0/6/130639445/gojilimelul.pdf
    • http://avrilhitman.com/uploads/1/3/1/3/131383416/bdae07417fca5e.pdf
    • http://small-product-photography.com/uploads/1/3/0/4/130475881/dinusiziv.pdf
    • http://lunalashky.com/uploads/1/3/0/6/130603979/435b3033deaee.pdf
    • http://lonigro.ch/uploads/1/3/0/7/130776349/pinol.pdf
    • http://thealphamind.com/uploads/1/3/0/7/130739315/mijezumilamikupujin.pdf
    • http://pardeevillecakeshop.com/uploads/1/3/0/2/130289476/xusanajazuk.pdf
    • http://opti-shield.com/uploads/1/3/0/5/130588231/bibivadopodab_lavomabojebi_voxefogumoj.pdf
    • http://acafeend.com/uploads/1/3/0/3/130313440/solaguvepiti-jotobup-volew-miturigav.pdf
    • http://amylwilliamsportfolio.com/uploads/1/3/1/3/131384679/tabevuwipo.pdf
    • http://msluxuryhouses.com/uploads/1/3/0/6/130639275/2ab4c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006279.bin
adc0a82417ce0d15582fcca617923e3002d5017fea920a4e34eeb1b5526a9455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6279 8016 bytes
font_01_sfnt_off00008193.bin
cf2338b7895a3a873add1db7dfb411390262a2a3d24e5b3dccff59843624ea97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8193 2704 bytes

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