Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37dd290edeeffe5…

MALICIOUS

PDF

35.1 KB Created: 2020-03-28 12:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 169a818d47db62c46d4969bedbf47fce SHA-1: 0f33a5ff1ecb4dbc15088dc31a6bcf1014e5b579 SHA-256: a37dd290edeeffe506c0b4d3d04c2880f2ca4df41292744e34964bd9dc1dc2c4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.001 PowerShell

The PDF contains numerous external links, a technique commonly used for SEO spam or to direct users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that appears to be the primary lure, directing users to a page with a title related to 'meaning of nic noc and nanda'. The presence of many similar URLs hosted on various domains suggests a link farm or a large-scale phishing operation.

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://misbailes.com/uploads/1/3/0/3/130313178/130313178.html#significado+de+nic+noc+y+nanda
    • http://greensolutionsprovider.com/uploads/1/3/0/7/130738697/fd22cc5.pdf
    • http://historysheroes.org/uploads/1/3/0/5/130588913/lurinodefalizot_padudofumu_runet_falikaj.pdf
    • http://thedowntowndoowop.com/uploads/1/3/0/9/130969301/netedanulubaxi.pdf
    • http://www.shopjaysoffroadgear.com/uploads/1/3/0/4/130436071/gufuv-xudadorirejid-dejitavikitin.pdf
    • http://www.healthcarejustice-pbc.com/uploads/1/3/0/5/130588966/wobes.pdf
    • http://lightyoursoulup.com/uploads/1/3/0/7/130775529/1912183.pdf
    • http://www.loraleevenue.com/uploads/1/3/0/2/130289393/b405f139e.pdf
    • http://www.sahraouiabdelkrim.com/uploads/1/3/0/8/130874318/2799294.pdf
    • http://jpmportfolio.org/uploads/1/3/0/7/130776132/semelekekoxirus_rarokib_devawevulato_kugep.pdf
    • http://cartoontherapy.com/uploads/1/3/0/5/130589114/2863235.pdf
    • http://movedomaintonewaccttest.com/uploads/1/3/0/4/130475879/7238560.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_off0000627b.bin
e301a2be5bb84f8addd7f825f0cab1b08a81988c79ee6e4709dd5c324f214b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 7540 bytes

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