Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcce691c2f12dac…

MALICIOUS

PDF

45.3 KB Created: 2020-03-29 08:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ac2610372632c7fd18e0a5f8de8e1428 SHA-1: 245fcc72f002cefde1f37b442eacaefc8a930217 SHA-256: 6dcce691c2f12dacec982f144dca5a5610f0e32025fb7cd8ee9e795514a5ac09
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a 'link farm' by heuristics. The embedded URLs, such as http://51.bpmtc.com/uploads/1/3/1/4/131407353/131407353.html#tipos+de+textos+recreativos+literarios, suggest a deceptive purpose, potentially for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of a malicious intent, likely related to initial access via spearphishing.

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://51.bpmtc.com/uploads/1/3/1/4/131407353/131407353.html#tipos+de+textos+recreativos+literarios
    • http://innovatin.com/uploads/1/3/0/2/130291785/825426ed.pdf
    • http://marianelaforest.com/uploads/1/3/0/5/130550880/roride_kojuwuduliked.pdf
    • http://eatfns.com/uploads/1/3/1/4/131438432/mobefozojumaruf.pdf
    • http://aph1.aphorticultura.pt/uploads/1/3/0/6/130620412/f28df66854.pdf
    • http://fake-estate.com/uploads/1/3/0/8/130814900/melugulifedug.pdf
    • http://motoemporio.com/uploads/1/3/1/0/131070678/3069605.pdf
    • http://webdisk.ngabwe.com/uploads/1/3/0/7/130739978/2584003.pdf
    • http://mebyevi.com/uploads/1/3/0/6/130639173/e12df164.pdf
    • http://www.blikko.no/uploads/1/3/0/7/130776406/dimuxamuxidelutivapu.pdf
    • http://www.goodidealschool.com/uploads/1/3/0/5/130551962/6b032c7.pdf
    • http://tammybrideau.com/uploads/1/3/0/8/130874011/viponimumegezof_misalulubefem_vafanokim.pdf
    • http://stuartashwoodgolf.com/uploads/1/3/0/7/130738727/figojotiwu.pdf
    • http://zumbawithchad.com/uploads/1/3/0/4/130436050/5078423.pdf
    • http://executivewomencoaching.com/uploads/1/3/1/4/131437671/59d3c2b59dd9.pdf
    • http://levainbakerytraining.com/uploads/1/3/0/2/130270977/5015dc1.pdf
    • http://mosie.org/uploads/1/3/0/8/130874670/d0d412bf1c5ece.pdf
    • http://painfreebalm.com/uploads/1/3/0/5/130589040/5b4cdb1d02b481.pdf
    • http://trainorlab.dss.ucdavis.edu/uploads/1/3/0/6/130621388/fituwu-gusodimekudabe.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007202.bin
68e43284929df6c4797d293a1c48b4fe306877748db942e17971b7c1c3725cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7202 9172 bytes
font_01_sfnt_off000092ed.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92ED 16036 bytes

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