Malicious PDF — malware analysis report

Static analysis result for SHA-256 1049a3902c2eaac0…

MALICIOUS

PDF

62.9 KB Created: 2020-03-10 06:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7056d1b1c4f0850d579fc78d6eef78b6 SHA-1: db149e3aea15f7e11de9f2eb49b19b34a450e388 SHA-256: 1049a3902c2eaac0891b97ab96d31879b48aeb69a3eee72288ee63febabeb20f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured as SEO spam or potential phishing lures. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to drive traffic to a network of linked sites. No scripts were extracted, but the extensive link farm points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://host84.carmichaelnl.com/uploads/1/3/0/8/130874266/130874266.html#affine+geometry+books
    • http://gooddaymovie.com/uploads/1/3/0/4/130483804/23d01d7d801b.pdf
    • http://www.fiskbuilthomes.com/uploads/1/3/0/5/130589268/titavijotejixeju.pdf
    • http://almanaquecircular.com/uploads/1/3/0/5/130540104/zawemenim.pdf
    • http://residentialsalessolutions.com/uploads/1/3/0/4/130476703/5eb54bdeed45cc.pdf
    • http://mnlifecoach.com/uploads/1/3/0/2/130270776/kixavidebati-donefidavuw.pdf
    • http://fertilityanswers.org/uploads/1/3/0/6/130620519/7261417.pdf
    • http://mywhiteprivilege.org/uploads/1/3/0/5/130543280/8181c48.pdf
    • http://ribligion.com/uploads/1/3/0/7/130776401/totogota.pdf
    • http://nicsantrading.com/uploads/1/3/0/7/130738616/5b358b0.pdf
    • http://kerrymckenna.com/uploads/1/3/0/8/130874340/tusiba_ginatodu_botobatol_mepapuni.pdf
    • http://autotransportcheap.com/uploads/1/3/0/5/130541285/bevoso.pdf
    • http://www.cweventstaff.com/uploads/1/3/0/7/130740625/a7ac746.pdf
    • http://creativetimberltd.co.uk/uploads/1/3/0/6/130639561/gigojirifosuwon.pdf
    • http://zpdevsite.com/uploads/1/3/0/6/130604185/kukagesenadezilumoni.pdf
    • http://internationalaid.net/uploads/1/3/0/4/130476778/sojepoxobopafopav.pdf
    • http://mlstourney.com/uploads/1/3/0/2/130289225/xisavazodeba.pdf
    • http://mail.nepagazette.com/uploads/1/3/0/2/130272484/3666234.pdf
    • http://noseyroseytiedye.com/uploads/1/3/0/5/130543588/3722512.pdf
    • http://webdisk.curriculumconsults.com/uploads/1/3/0/4/130476342/5465806.pdf
    • http://deborahdion.com/uploads/1/3/0/7/130776260/ca35a810ad4825.pdf
    • http://racersandsponsors.com/uploads/1/3/0/5/130539922/bd46f37e.pdf
    • http://www.antibes-psychologue.com/uploads/1/3/0/6/130604682/pexikukub.pdf
    • http://exhalemobilespa.com/uploads/1/3/0/7/130739853/e12829f.pdf
    • http://mysimplyonlyshawlsscotland.co.uk/uploads/1/3/0/7/130739967/mipap-zuran.pdf
    • http://rgbgrasstunes.com/uploads/1/3/0/5/130550921/palabix-zifusofibuxo-nunuzilapa-vogugu.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a688.bin
61340af23c53e3b2467509b71fec99764e474e706505d4b5ddcc96242b91940c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA688 10204 bytes
font_01_sfnt_off0000cafe.bin
63f5e27ee3d24cc00d413e59c301cc73ab377383609796993547673f2bea898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 2600 bytes
font_02_sfnt_off0000d42a.bin
dafc56ccf0667e7146dbeae70b189bdb6c8e655f540d207599de2f4a32db3438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 16536 bytes

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