Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba01a092ead8664…

MALICIOUS

PDF

32.5 KB Created: 2020-05-15 13:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78994f88a22a0a49da85ef45aca48a1b SHA-1: 229cb874edcb842e0e774d8ad1f06795de40ac90 SHA-256: 6ba01a092ead8664ffd800cb0bd061ee31d8b412a0f00a080320b45895a5012b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and heuristic firings point to a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oxfordfitfun.com/uploads/1/3/0/5/130550994/130550994.html#chottanikkara+song+ringtone
    • http://real-broker.net/uploads/1/3/0/9/130969888/diwebe.pdf
    • http://groenrang.com/uploads/1/3/0/5/130551311/4620559.pdf
    • http://tekbsb.org/uploads/1/3/1/3/131379874/rojulawosilusunana.pdf
    • http://helendear.org/uploads/1/3/0/6/130603946/lunijadut-napaxaz-bubereto.pdf
    • http://agaverealestate.studio/uploads/1/3/0/2/130271184/mukakilasijixunera.pdf
    • http://royalbluerescue.org/uploads/1/3/0/2/130289669/5fb70947.pdf
    • http://sellnanashouse.com/uploads/1/3/0/8/130814286/425b20d48.pdf
    • http://rosemaryxu.com/uploads/1/3/1/8/131856244/sebovekepajeputibor.pdf
    • http://adoravida.com/uploads/1/3/0/2/130287919/7233b345cc.pdf
    • http://johannashomecare.com/uploads/1/3/0/4/130483806/55e6bc.pdf
    • http://andersonbasketballacademy.com/uploads/1/3/0/8/130874298/nutuwotosaneloz_ruroxem_gaxel_wevedogu.pdf
    • http://laxxcbd.com/uploads/1/3/1/4/131453006/818259c504b52.pdf
    • http://growlerlake.com/uploads/1/3/0/3/130323967/150a089f6ef45f0.pdf
    • http://indolaw.net/uploads/1/3/0/6/130640003/zorudujunepize.pdf
    • http://mellmadedesign.com/uploads/1/3/0/5/130589269/ea9477.pdf
    • http://green57.com/uploads/1/3/0/4/130483981/dfd4b.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054c6.bin
cced95a333ebdd00ecaadb08fcb26cd4f84b360aeb5fa1b84f7382097059ee65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C6 9860 bytes

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