Malicious PDF — malware analysis report

Static analysis result for SHA-256 755ee9637cf7158d…

MALICIOUS

PDF

39.7 KB Created: 2020-03-12 09:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 50ac52bc632ef675b49e252c239458c3 SHA-1: 318368e0b443402077000eb14f8d17c2f795e8d0 SHA-256: 755ee9637cf7158db22dece1eeebecc15ed6750b3c24dd073873c32eaf131676
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many with numeric slugs, indicative of a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, suggesting a spearphishing attachment delivery vector.

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://wcd-bzi78bsj.mgh-r.ch/uploads/1/3/0/6/130621455/130621455.html#the+concise+oxford+dictionary+of+politics+and+international+relations+pdf
    • http://mtg.blue/uploads/1/3/0/7/130776078/xaresek_zokubeki_zabusuba_fepezovexapulur.pdf
    • http://www.handfdesign.com/uploads/1/3/0/8/130874376/7fd7f.pdf
    • http://www.theaudiobookvault.com/uploads/1/3/0/7/130775969/ca995c3dd.pdf
    • http://ritaschabelcounseling.com/uploads/1/3/0/9/130969655/0d6f6dfc5b.pdf
    • http://intrader.net/uploads/1/3/0/8/130874676/2634659.pdf
    • http://watersportsrep.com/uploads/1/3/0/4/130436163/regure.pdf
    • http://misspurcellsclassroom.com/uploads/1/3/0/3/130323392/436264.pdf
    • http://mjarriolawebcreations.com/uploads/1/3/0/7/130740019/8fdf55a4.pdf
    • http://www.inthetimeofeight.com/uploads/1/3/0/5/130539795/e585de1bdc.pdf
    • http://calicustomchico.com/uploads/1/3/0/3/130313037/9855990.pdf
    • http://fleabayers.com/uploads/1/3/0/2/130287457/tosubotewosugop.pdf
    • http://robertpirsig.net/uploads/1/3/0/2/130291438/5989776.pdf
    • http://marie-elisabeth-gaudefroy.com/uploads/1/3/0/6/130621947/jafixenejaj.pdf
    • http://sweettuth.shop/uploads/1/3/0/7/130738631/1743769.pdf
    • http://server65205.misscarols.com/uploads/1/3/0/5/130588786/db0da2.pdf
    • http://vinculumartfinance.com/uploads/1/3/0/5/130588195/zobulisimigivuv.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_off00007065.bin
6055ad6357ced1c4ee6503f99e82578cbdd9deef42885fc464c7b08d9779cab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7065 7816 bytes

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