Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf874cc6d2a3869…

MALICIOUS

PDF

31.9 KB Created: 2020-03-29 04:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 175e840152719f4ed9ab416b7decbc20 SHA-1: daa847fc3f0b218c810a601ba377da1363cc4f4c SHA-256: fdf874cc6d2a386910a3c74eaadd21b46983a51b435171cfffb05a485b91a44e
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://hotelvic-phase2-ja.devsite-1.com/uploads/1/3/1/4/131411024/131411024.html#b+flat+clarinet+altissimo+finger+chart
    • http://angryskipperfamilysupportnetwork.org/uploads/1/3/0/5/130546024/jarivepobomonap.pdf
    • http://julianahilton.com/uploads/1/3/0/7/130775750/jakujukamolumiw_zoxufilu_wivapo_telumemuzowukam.pdf
    • http://cpanel.stewartvillesportsmansclub.com/uploads/1/3/0/6/130621459/purolodoxufu.pdf
    • http://venturavineyards.com/uploads/1/3/1/0/131070619/7dc862191e789.pdf
    • http://mewantemooseicdayglasgow.com/uploads/1/3/0/7/130775358/zivobawim-welanaxagiz.pdf
    • http://modernsolution.hk/uploads/1/3/1/0/131070488/f24138d1b07ec93.pdf
    • http://technology-safari.com/uploads/1/3/0/6/130639024/tegakuxub-vunutafugo-sazimorokejamo-wilixejop.pdf
    • http://eflsignes.com/uploads/1/3/0/5/130544063/perokifapevoj.pdf
    • http://majesticmousepads.com/uploads/1/3/0/4/130483132/4aab8742b.pdf
    • http://gillinghamtravelltd.com/uploads/1/3/0/5/130551210/3664235.pdf
    • http://www.fatcityrocks.com/uploads/1/3/0/6/130604631/8e14088f38.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057fc.bin
f344a21929eb40cadf8a349062056cc16a9a186f9a99caa2db477fe60b155223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57FC 6712 bytes

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