Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed3407aa657df60…

MALICIOUS

PDF

37.8 KB Created: 2020-06-11 22:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d0c9b5e36d5a732a974d2ae1c4fb991 SHA-1: 41410d837e29abd125f1b106002a033c11a9f02e SHA-256: 6ed3407aa657df60ac16800be943629830013955651381064d8f43c988e09e87
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links, identified as a link farm. The ML classifier strongly indicates maliciousness, and the presence of numerous URLs suggests an attempt to redirect users to potentially malicious sites or for SEO spam purposes. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://7qswk.bpmtc.com/uploads/1/3/0/5/130588611/130588611.html#tour+of+mont+blanc+complete+trekking+guide
    • http://dristiliarispracticemanagment.com/uploads/1/3/1/3/131379726/ladapa.pdf
    • http://livefreediecuts.com/uploads/1/3/0/6/130603793/8456795.pdf
    • http://thrufeedcommunications.com/uploads/1/3/0/3/130323437/dazunutel.pdf
    • http://cheyenne-nailsandbeauty.ch/uploads/1/3/0/2/130271232/c179e.pdf
    • http://ewatrela.com/uploads/1/3/0/8/130813667/kexojixasufe.pdf
    • http://gbartonart.com/uploads/1/3/0/7/130776211/razekojavuvamel-gefus.pdf
    • http://risingstarschildminding.co.uk/uploads/1/3/1/6/131636886/kubivamomudel_tapevut_sifotifiz_jagudugin.pdf
    • http://profundo.asia/uploads/1/3/0/5/130542781/54cb098f.pdf
    • http://mta-sts.mail.themodestshoptx.com/uploads/1/3/0/7/130775261/1427490.pdf
    • http://usabikeblog.com/uploads/1/3/0/6/130605273/zigodafuj_girijabar.pdf
    • http://rachaelkart.com/uploads/1/3/1/4/131483488/3b2ea1d707.pdf
    • http://signacarenewross.ie/uploads/1/3/0/2/130289224/f83679984.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rirewiza.files.wordpress.com/2020/06/58533632380.pdf
    • https://kawebori.files.wordpress.com/2020/06/55101991073.pdf
    • https://bifariki.files.wordpress.com/2020/06/81059815451.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_off00006876.bin
1bcddae56bc8a0f87d59f6a54263e770ffd0d831e5a86e8ff6c4634872b3a350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6876 10176 bytes

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