Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d555ef66359478…

MALICIOUS

PDF

40.4 KB Created: 2020-03-24 12:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2fb19b0b06eb36f49f81f293537c4dff SHA-1: 5c46413aead9845b217ee5aa829dec8cddf75e5e SHA-256: 23d555ef6635947837b94af1968b444b68cb389175f6a9e3422df35b394f5a1c
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or redirection scheme designed to obscure the ultimate destination or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted from this sample.

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://colorscape-art.com/uploads/1/3/0/7/130739575/130739575.html#cirque+du+freak+books+1+pdf+download
    • http://oscarthedumpertruck.com/uploads/1/3/0/4/130491599/pewederakegobepiv.pdf
    • http://www.stonearchdesigns.com/uploads/1/3/0/5/130590474/xemetakezifuworivosi.pdf
    • http://thenationalhellenicsociety.org/uploads/1/3/0/6/130605307/54ac728.pdf
    • http://verification-pcs.fr/uploads/1/3/0/5/130551341/766a2f53e2.pdf
    • http://vitalitysportsmassage.com/uploads/1/3/0/7/130776841/fca22cf748bd101.pdf
    • http://livingleadershipretreats.com/uploads/1/3/0/5/130590661/066e094adcc.pdf
    • http://thearmadillobrothers.com/uploads/1/3/0/3/130313106/5717929.pdf
    • http://radiantsoulrecords.com/uploads/1/3/0/4/130476203/bojodulabipuwanewama.pdf
    • http://sklenizavarovanje.si/uploads/1/3/0/5/130542729/tabapumipuvax_nalawe_vobagonuja_famozodupuka.pdf
    • http://nptp.pl/uploads/1/3/0/4/130435985/ba9aa3.pdf
    • http://xrdsfaith.com/uploads/1/3/0/7/130739063/4b97df85.pdf
    • http://mixrobot.net/uploads/1/3/1/0/131070521/zugalazoduxisusetivo.pdf
    • http://hollykompportfolio.com/uploads/1/3/0/2/130271095/88a26ffc7ab383.pdf
    • http://graphicfable.com/uploads/1/3/0/5/130588445/bowagano.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_off00006ad0.bin
6e8586122c9bd1cf45daa0cf8ef025e583753dae06734d28d45ac75834d4e366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD0 7600 bytes
font_01_sfnt_off000088be.bin
0a74f62927e6506cf556ce04093ddaf717254a888a2313c4e0126ed6d6ed1ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 2484 bytes

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