Malicious PDF — malware analysis report

Static analysis result for SHA-256 994d55e32b0a0756…

MALICIOUS

PDF

56.6 KB Created: 2020-03-29 14:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d7fd5debf10a8aca498a07514104cbe3 SHA-1: 3541c710eb8d4f1706df4ef6aa45364a64a8aa3e SHA-256: 994d55e32b0a07568a973b43a63638d67c945e88d86de48dc7bd76d4503eb4cd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links pointing to various domains, a technique commonly used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'socialismo siglo xxi' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure document designed to drive traffic to a network of linked PDFs.

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://sta-66-99-58-206.ladse.org/uploads/1/3/0/2/130289448/130289448.html#definicion+de+socialismo+siglo+xxi
    • http://thelivechatcafe.com/uploads/1/3/0/9/130969283/wizaxekusorubev-timijem-ganujobil-zowigifaruduno.pdf
    • http://grandlenstudios.com/uploads/1/3/0/4/130476652/6601154.pdf
    • http://economicsocialjustice.org/uploads/1/3/0/6/130604129/legagul.pdf
    • http://kesascove.com/uploads/1/3/0/5/130590195/378c7db3.pdf
    • http://groismantm.com/uploads/1/3/0/5/130541443/7203923.pdf
    • http://altanconsulting.com/uploads/1/3/0/7/130775011/e585bb9b5f54cf.pdf
    • http://littleplates.net/uploads/1/3/1/1/131164048/kubixa_mobefed_dunaf_lazaxi.pdf
    • http://snugnut.com/uploads/1/3/1/3/131380825/fc6caef.pdf
    • http://laralavenderoils.com/uploads/1/3/0/7/130740046/livaxiguxisox.pdf
    • http://suilah.com/uploads/1/3/0/7/130775594/vebekebewo-noxoros-xizoper-nenovunewawepu.pdf
    • http://emcscotland.com/uploads/1/3/0/6/130639605/5879737.pdf
    • http://kodiakislandfoodbank.org/uploads/1/3/1/3/131398113/kibegulojetevife.pdf
    • http://usad2a.com/uploads/1/3/0/4/130475982/35a130af213f.pdf
    • http://jahjahshakur.com/uploads/1/3/0/7/130775078/92594248d.pdf
    • http://masterzeven.com/uploads/1/3/0/7/130740232/2006460.pdf
    • http://djmmarketplace.com/uploads/1/3/0/3/130323962/xisogadozili_vepuwig_xuziso_vupunukigovimi.pdf
    • http://hentylifestyle.com/uploads/1/3/1/0/131070483/187385.pdf
    • http://carlyhuntley.com/uploads/1/3/0/4/130436450/towufalalam-muputulenobov.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_off00009d16.bin
8c0a9c6abe3edda4e2cf319f8d657b071b9f31576b4377cbc111e2957b2971fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D16 9256 bytes
font_01_sfnt_off0000be7e.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 16036 bytes