Malicious PDF — malware analysis report

Static analysis result for SHA-256 98638b0bad4a581f…

MALICIOUS

PDF

46.6 KB Created: 2020-04-03 04:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10c5cf8c657aea613da447f748d75c84 SHA-1: 947788168932eb3d29ce195c743e2fc8fc100864 SHA-256: 98638b0bad4a581fdb858d1a3dc70a5cad988270f7cf68be2788236d025c3d07
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Pdf como ganar amigos e influir en las personas' and references the wkhtmltopdf tool, suggesting a lure document. The primary attack pattern involves directing users to a network of suspicious domains.

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://lilarot-vipshop.eu/uploads/1/3/1/0/131071047/131071047.html#pdf+como+ganar+amigos+e+influir+en+las+personas
    • http://citychariots829.com/uploads/1/3/0/5/130543158/7440171.pdf
    • http://charlottedreamscapes.com/uploads/1/3/0/6/130605016/17039befc5e30a.pdf
    • http://keepinfresh.com/uploads/1/3/0/2/130289813/walovolug.pdf
    • http://fevrmedia.com/uploads/1/3/0/7/130740027/c69aa12e2c7ec7.pdf
    • http://givinghandsassociation.com/uploads/1/3/0/4/130476784/d7b7f47997.pdf
    • http://celestialtrade.com/uploads/1/3/1/0/131071151/b8eec1ba647c12.pdf
    • http://adamjarvisdesign.com/uploads/1/3/0/6/130604083/fujubag_kukotuxosute_sudekola_munafakezi.pdf
    • http://whatsintermittentfasting.com/uploads/1/3/0/6/130621165/2140516.pdf
    • http://emmanderson.com/uploads/1/3/0/8/130814127/3240034.pdf
    • http://realty33nj.com/uploads/1/3/1/1/131163740/64c9e7b3c.pdf
    • http://21stcenturyfertility.org/uploads/1/3/0/8/130874669/4140737.pdf
    • http://colormeribbons.com/uploads/1/3/1/3/131383854/kasatuwubob_ladesuwu_fuwikonorazunu_jewikusegutaba.pdf
    • http://davidquy.com/uploads/1/3/0/5/130539203/litadidefejusukojili.pdf
    • http://christophergodinez.com/uploads/1/3/0/5/130550873/8003729.pdf
    • http://mar-c-shop.com/uploads/1/3/0/5/130539340/wesolik-jizakoxelek-pukamuwuf-tukibumunufu.pdf
    • http://chemoil.lt/uploads/1/3/0/7/130738764/nojebevuwaluwisiza.pdf
    • http://tailgate4dogs.net/uploads/1/3/0/7/130775828/sujumew.pdf
    • http://funkydopemaneuvers.com/uploads/1/3/0/7/130775001/tuxenedareran-wusimesewij-kexad.pdf
    • http://limitlesshealthandfitness.com/uploads/1/3/1/4/131412603/5cac7e3d.pdf
    • http://faithviewhc.com/uploads/1/3/0/6/130620506/kevetebipa_tanulole_pitono.pdf
    • http://joshkanownik.com/uploads/1/3/1/4/131438873/mizafep-gatagaxexamimam-xilow.pdf
    • http://aperfectday.rocks/uploads/1/3/0/2/130271195/buxivipew.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_off0000899b.bin
d52d4105ac3862fe33a65f622085977b180a6bd1577de2fcf9a70b1a8efebd92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899B 9212 bytes

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