Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c78996fa357ac1a…

MALICIOUS

PDF

40.1 KB Created: 2020-04-08 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 578dcc47598d34836bcd8d7cd9f23dbe SHA-1: aeae393ccc3a38fb466db9d453ce711a122425b0 SHA-256: 6c78996fa357ac1a7a856f81a8c64fe1d025fba3391657a8d552d4f0e6ba0803
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, suggesting a link farm or SEO poisoning tactic to drive traffic to potentially malicious sites. The document body, while appearing technical, is likely a lure to disguise the malicious intent of redirecting users. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious document designed to lead users to external 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://westcoastescrrow.com/uploads/1/3/0/6/130620371/130620371.html#problemas+de+programacion+lineal+metodo+grafico
    • http://shanerau.com/uploads/1/3/0/6/130604566/8871479.pdf
    • http://cityprollc.com/uploads/1/3/0/4/130488970/62cafc7871.pdf
    • http://consoul.org/uploads/1/3/0/6/130639228/mavevap.pdf
    • http://americansatelliteservice.com/uploads/1/3/0/7/130738565/9212094.pdf
    • http://alwaysamigosyoga.com/uploads/1/3/0/7/130740169/webegonikirefe.pdf
    • http://the-jowell.com/uploads/1/3/1/3/131398131/3dec6a.pdf
    • http://barbarabairddesign.com/uploads/1/3/0/5/130538842/lavubabupimugez.pdf
    • http://rtbartist.com/uploads/1/3/1/0/131069997/e8319e.pdf
    • http://robertbell3317.com/uploads/1/3/0/4/130483631/jenalevatilusap.pdf
    • http://lifestyleliving.solutions/uploads/1/3/0/4/130483402/9592815.pdf
    • http://lashlanestudio.com/uploads/1/3/1/4/131408415/d616484af.pdf
    • http://mamamayimusic.com/uploads/1/3/1/0/131071175/kelidudijupuxumek.pdf
    • http://brokenarrowdiving.org/uploads/1/3/0/2/130288545/navofojuvomuxa.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_off000070ef.bin
bc5930246b3dcd832649f51ca22125518024b1fc0e3f1014069cc62f1a0c4757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EF 8856 bytes

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