Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f26e0871af7214…

MALICIOUS

PDF

40.8 KB Created: 2020-03-22 05:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cab594c2aa212c533bccb941fd5efa3f SHA-1: cabdeec008d2ffc5f7d9aa0c659d5525c38017a5 SHA-256: 66f26e0871af72147899961fb4fffc951977e014418207efc3961523f3fa7155
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The embedded document body text is heavily obfuscated and appears to be a mix of metadata and corrupted content, but it does contain URLs that are also listed in the extracted URLs. The primary attack pattern appears to be directing users to a link farm, 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://toeachfromeach.org/uploads/1/3/0/5/130588924/130588924.html#sgplot+x+axis+values
    • http://hostmaster.serlogistics.co.uk/uploads/1/3/0/6/130620833/nanaziguxera.pdf
    • http://mta-sts.lists.dellxl.org/uploads/1/3/0/6/130639504/levotizeki.pdf
    • http://battlecreekbh.com/uploads/1/3/0/7/130775189/kumisowomozulom-zivubenik-fefulotipixe-vewegiroxaj.pdf
    • http://soniashearer.com/uploads/1/3/0/7/130776585/fbc9116b87.pdf
    • http://teammonstersinthemaking.com/uploads/1/3/0/6/130604838/39b8f.pdf
    • http://gravtech.org/uploads/1/3/0/5/130542863/lugojonig_sozuf.pdf
    • http://shafact.com/uploads/1/3/1/1/131164136/3260625.pdf
    • http://readcoolbeans.com/uploads/1/3/0/3/130379155/4191705.pdf
    • http://www.tstraw.com/uploads/1/3/0/7/130739264/8707851.pdf
    • http://thomasdalonzood.com/uploads/1/3/0/6/130621191/584e8d866.pdf
    • http://bamsalesteam.com/uploads/1/3/0/7/130775355/5924434.pdf
    • http://fartingbananas.com/uploads/1/3/0/5/130539922/9562409.pdf
    • http://nataliahermida.com/uploads/1/3/0/7/130738752/1743835.pdf
    • http://team329.com/uploads/1/3/0/4/130483147/fe8f64aeaa0cbb.pdf
    • http://www.academymededfellowship.com/uploads/1/3/0/9/130969800/xinosel.pdf
    • http://mta-sts.kato-drumschool.com/uploads/1/3/0/7/130776220/povemasasuboxamav.pdf
    • http://www.easterndominican.org/uploads/1/3/0/6/130620295/3b8eded1d1.pdf
    • http://lifeexperienceprofile.org/uploads/1/3/0/5/130544539/kuvofokolumibaseg.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_off0000768d.bin
b0b38b2e60ed3d7ce8a93396cdff0158e5e9b24f3104add1054609dbe9551845
pdf-font-stream PDF embedded font (sfnt) at offset 0x768D 8200 bytes