Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9aa6a8cc0fc370…

MALICIOUS

PDF

28.9 KB Created: 2020-06-15 01:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98479fce9dbf74eafa4cb5cac2c9c746 SHA-1: fd1d328fc12524e2c93357c271a810549979f796 SHA-256: 7b9aa6a8cc0fc3707881b9abf91476265de5a0039c1de00e59cea9ee986af6e1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. These links likely serve to direct users to malicious websites or for SEO manipulation, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://burtonbiofuels.com/uploads/1/3/0/4/130493893/130493893.html#knowledge+work+system+pdf
    • http://houseofangelcardreadings.com/uploads/1/3/0/7/130775031/jamosukiw.pdf
    • http://mx.pabi.org/uploads/1/3/0/4/130488295/rozilegudigibo.pdf
    • http://loveblubags.com/uploads/1/3/0/5/130551696/fonubafamule.pdf
    • http://brainbrandllc.com/uploads/1/3/0/7/130739817/4557845.pdf
    • http://zakiaz.com/uploads/1/3/0/4/130483248/gubuxapoj.pdf
    • http://74-123-73-221.mgwnet.com/uploads/1/3/1/6/131636833/vuromifob_nigajomoxune_gifubasufu_xuwenufulorekil.pdf
    • http://autodiscover.chizelfitnessstudio.com/uploads/1/3/0/6/130620731/luxinaxibe_sebif.pdf
    • http://shawnemay.com/uploads/1/2/9/3/129354459/129354459.html?image
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://futidufesag.files.wordpress.com/2020/06/27034518077.pdf
    • https://tawufas436705345.files.wordpress.com/2020/06/68724208619.pdf
    • https://riwimatuko.files.wordpress.com/2020/06/85662735081.pdf
    • https://gizefonafo.files.wordpress.com/2020/06/losorawuxonini.pdf
    • https://fewogixaba.files.wordpress.com/2020/06/29630049093.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000499f.bin
53aa5b78dc377ab452f0313b11e59f327536ad976e6a0e4a538b6281a9fc56d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x499F 9144 bytes

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