Malicious PDF — malware analysis report

Static analysis result for SHA-256 5235cd68e4d289b4…

MALICIOUS

PDF

42.7 KB Created: 2020-03-22 10:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1259096c9cf3196918bc8310a5d47db9 SHA-1: ef5be925b918e17eddc608417e2c605d1832592a SHA-256: 5235cd68e4d289b4cf3406ab3cfad0484dcb934ceb1182bb5f0270327b0b512f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains numerous external links to a network of domains, a technique often used for SEO link farming or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body text, while appearing innocuous, is likely a lure to encourage interaction with the embedded links. The primary attack pattern involves directing users to a large number of generated PDF files hosted on various domains.

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://drgnzombiestournament.com/uploads/1/3/0/3/130323329/130323329.html#ejemplos+de+adjetivos+comparativos+en+ingles+de+una+silaba
    • http://youknowme757.com/uploads/1/3/0/3/130379353/vituz.pdf
    • http://clin-tech.org/uploads/1/3/0/5/130545360/7134408.pdf
    • http://mycecilialopez.com/uploads/1/3/0/6/130621110/bovorupeno.pdf
    • http://wellbeinginbusiness.org/uploads/1/3/0/4/130436282/2782443.pdf
    • http://mobilehrandleadershippros.com/uploads/1/3/0/5/130550741/6094602.pdf
    • http://100firesmoto.com/uploads/1/3/0/6/130604805/xixixituvesefumut.pdf
    • http://lmafitness.net/uploads/1/3/0/6/130604509/nedumawuw.pdf
    • http://opbaspartans.com/uploads/1/3/0/5/130589032/xirere_nufadifofexezin_nakudopopux.pdf
    • http://psychedelicsmadnessawakening.com/uploads/1/3/0/8/130815228/kobesapemi.pdf
    • http://www.trtidalwave.com/uploads/1/3/0/7/130739258/57abc5bb9664b1.pdf
    • http://coryfair.com/uploads/1/3/0/8/130813658/federunozexepe_nimijak.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662d.bin
7aff2764ee325bde1fd48709230542a9db2ad4d1c67446d584f74f5d077ff5ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662D 9168 bytes
font_01_sfnt_off00008777.bin
451895f61762ee2c92071758aadde1050fcd1a41f8262062c25ecb60f5c137f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8777 16340 bytes

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