Malicious PDF — malware analysis report

Static analysis result for SHA-256 8521fd90e0e60da3…

MALICIOUS

PDF

45.6 KB Created: 2020-03-26 03:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf7310e58a4435fe882bbe9f1df6746c SHA-1: 907d94a93028e8e1610e1d50b74ca72fd367964f SHA-256: 8521fd90e0e60da3c7f909da8a6e255bec79f11a5a18c5e8011f689b00cc7565
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect users or host malicious payloads.

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://jeaandpra.com/uploads/1/3/0/7/130776885/130776885.html#dise%C3%B1o+y+estructura+organizacional+introduccion
    • http://nwspecialtylumbermill.com/uploads/1/3/0/2/130289340/6518602.pdf
    • http://royalbluerescue.org/uploads/1/3/0/4/130435726/877e415868f7070.pdf
    • http://www.andrewspink.org/uploads/1/3/0/5/130551114/bekezirafovel.pdf
    • http://drivingschoolscoventry.mobi/uploads/1/3/0/7/130776878/miwufil-mimororis.pdf
    • http://cheapseats4firstclasseats.com/uploads/1/3/0/9/130969185/minitupesawik.pdf
    • http://animals-pro.com/uploads/1/3/0/6/130605244/nivagekeravi-zojoreroz-mupilovejojeg.pdf
    • http://myfoundation.us/uploads/1/3/0/5/130543261/7260909.pdf
    • http://www.jabissomaempreendimentoslda.solutions/uploads/1/3/0/5/130589286/jexuwanokime.pdf
    • http://www.youflup.com/uploads/1/3/0/3/130379222/330077.pdf
    • http://zetrocroofing.com/uploads/1/3/0/3/130323186/gutadidutiraza.pdf
    • http://marijuanalawvt.net/uploads/1/3/0/7/130739016/vukuju-wirelum.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_off0000844b.bin
e3c6e6a7a3e2fe332c841edcd0b493069d881d1ef7c2e2968efadc81a9ecc4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844B 9712 bytes

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