Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d784c829a0fe2a4…

MALICIOUS

PDF

43.2 KB Created: 2020-04-02 12:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1eb23a685e03dfd78919b192cc9e0702 SHA-1: 28072ba32f5e9202f24a9e665b2aa3b58bf5e1ad SHA-256: 5d784c829a0fe2a4dfc68c141f3d4d1ec664f7ba404d767308aa1f68dbba966c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://pecselfstorage.com/uploads/1/3/0/6/130605044/130605044.html#formacion+de+las+palabras+ejemplos
    • http://mta-sts.mail.mcastlemusic.com/uploads/1/3/0/3/130323835/kogomikisu_lifazaroweravez.pdf
    • http://healthfocus2020.com/uploads/1/3/0/9/130969699/f005743d18.pdf
    • http://conselheira-beleza.com/uploads/1/3/0/7/130776304/8974705.pdf
    • http://hogararcangelgabriel.net/uploads/1/3/0/3/130313021/robenoxotodibix.pdf
    • http://gracehappenshere.com/uploads/1/3/0/5/130590499/gizak.pdf
    • http://grovecitycarsandcoffee.com/uploads/1/3/0/9/130969874/4466628.pdf
    • http://brookerosephotography.com/uploads/1/3/1/4/131482887/fusutenatu-vefoxowifajefur-sotorizi.pdf
    • http://tcarsonmindbody.com/uploads/1/3/0/4/130435570/zonivos_rifojavafur.pdf
    • http://moongy.org/uploads/1/3/0/8/130813306/wenekuk-filisewaj.pdf
    • http://sofianicoleslife.blog/uploads/1/3/0/5/130589135/vomajefifet.pdf
    • http://gzapata-alma.com/uploads/1/3/0/9/130969131/banip_daxenedovemig_repabezere_jolitunitaxose.pdf
    • http://chron-optic.com/uploads/1/3/0/4/130489331/3645599.pdf
    • http://gadnadlan.com/uploads/1/3/1/4/131408364/15b90e081def054.pdf
    • http://partitionnow.com/uploads/1/3/0/7/130775441/057c9c4.pdf
    • http://tricialattin.com/uploads/1/3/0/5/130541745/2928585.pdf
    • http://always-mikeandmelissa.com/uploads/1/3/0/5/130589080/fodanilitasozeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075ae.bin
078f341bdce2122475f93c085da9956d0516c081b100174620a0db6625cc4cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AE 8336 bytes
font_01_sfnt_off00009427.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9427 2652 bytes

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