Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a277f0782dc915…

MALICIOUS

PDF

38.1 KB Created: 2020-03-15 06:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c88059b39789f4fdeda8568cf8dd542 SHA-1: 34aee60e660c088ac8b1247161080636f36ce2a3 SHA-256: 42a277f0782dc915bdb839f6681a37c525d02232880b3840f784721c70969e38
96 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, many of which are numerically or generically named, suggesting a link farm designed to manipulate search engine results. The document body, though partially corrupted, indicates a lure related to 'Igcse history paper 1 sample answers'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of suspicious URLs, likely for SEO poisoning or to host further malicious 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://clearhrsolutionsd.com/uploads/1/3/0/2/130287984/130287984.html#igcse+history+paper+1+sample+answers
    • http://fogartylundgross.com/uploads/1/3/0/5/130588276/bozetuwadasu.pdf
    • http://soundoftheshoals.com/uploads/1/3/0/5/130588802/palasivogiv.pdf
    • http://landandstars.com/uploads/1/3/0/7/130776176/xomevumoduj.pdf
    • http://warriorstrongadventures.com/uploads/1/3/0/4/130489275/fefc59.pdf
    • http://www.sneakermutt.com/uploads/1/3/0/7/130738989/divixa_zexakatamosen_piwalalixes_mezefikol.pdf
    • http://escaperoomcville.com/uploads/1/3/0/7/130776366/buxuvozeruvuwizimo.pdf
    • http://ayasuda.com/uploads/1/3/0/7/130776647/xilisozut_navovo_xaligamevatubad_jozoz.pdf
    • http://www.antonioalopez.com/uploads/1/3/0/6/130604633/vezotaretetevujon.pdf
    • http://hostmaster.peoplesgoldmine.com/uploads/1/3/0/6/130621607/ce739.pdf
    • http://machinegeneral.net/uploads/1/3/0/4/130476732/5468796.pdf
    • http://ambersjustcleaning.net/uploads/1/3/0/6/130604010/4301487.pdf
    • http://jirinovakdesigns.davidmichaeldesigns.com/uploads/1/3/0/4/130479082/pelepemusifawewazugu.pdf
    • http://www.easthamptonmusic.com/uploads/1/3/0/8/130874317/3da515280a481.pdf
    • http://www.chalkidiki-villas.com/uploads/1/3/0/8/130874485/3637868.pdf
    • http://www.wavelengthspsychologypc.com/uploads/1/3/0/3/130312944/270893.pdf
    • http://iamkimcole.com/uploads/1/3/0/6/130604633/502a597028cba.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_off00005ba6.bin
de7319ef527283000ba986d0955b5f7357bcc07913853d8c6cc085cf52be0914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA6 6456 bytes
font_01_sfnt_off00006b70.bin
edb7929bf9907cd3c651f9c5bb0c7681cca3bff285f9c0990a1eee7db24bead5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B70 8028 bytes

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