Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5904162fc3dd8e…

MALICIOUS

PDF

48.1 KB Created: 2020-03-12 14:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 100d8c24330bcd10aac7e7c19238f4b5 SHA-1: a79d2d529de67a82aeff372fa375e11599fc98af SHA-256: ed5904162fc3dd8e926dc9a20ba5f6f2910c0b2840db511c8d63cce35ee226b1
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external links, suggesting an attempt to manipulate search engine results or direct users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious. 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://marpalaceportuguese.devsite-1.com/uploads/1/3/0/4/130476078/130476078.html#acidosis+tubular+renal+tipo+2+fisiopatologia
    • http://baltictradeservice.com/uploads/1/3/0/3/130323332/1167290.pdf
    • http://crazyfreshstart.com/uploads/1/3/0/8/130874073/943a055584e.pdf
    • http://mortalissar.com/uploads/1/3/0/3/130323222/dffd1079d676708.pdf
    • http://mazzy.co/uploads/1/3/0/8/130874668/8264399.pdf
    • http://nwm2020.club/uploads/1/3/0/6/130621947/8914211.pdf
    • http://cemsinternational.com/uploads/1/3/0/3/130324044/mopofodabozezilopa.pdf
    • http://kzsnow.net/uploads/1/3/0/7/130739627/9173e.pdf
    • http://mail.vapinnvalpo.com/uploads/1/3/0/4/130476276/wijup.pdf
    • http://theprincessandtheangel.com/uploads/1/3/0/6/130604894/tojotemisovogag-kolefup-lusikomaxu.pdf
    • http://renemogensen.net/uploads/1/3/0/6/130621789/a70f95d20f0d8.pdf
    • http://callandputoptions.net/uploads/1/3/0/6/130604294/7488323.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_off00008560.bin
6b5a4a4a69ef99b556fc9c3eec7bf21faa5c5e41791e50b19cb67d173802eb3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 9604 bytes
font_01_sfnt_off0000a811.bin
c048ac4ed90d63bfae46472f65f9cf6fc0bd5e75369f2d8f28771a6d96a2731c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA811 3156 bytes

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