Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07adefe07aed152…

MALICIOUS

PDF

73.3 KB Created: 2021-02-19 12:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9c21d9d318250b0294af24d2853c03f SHA-1: b6440c53426e19f42494c0fd86c3507097ea1ba3 SHA-256: d07adefe07aed152b1f9a68336b57e031872fed646df5ce3eb5191f3812c4c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are disguised as legitimate documents like contract templates or application forms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://maypoin.ru/123?utm_term=in+the+mood+for+love+soundtrack+mp3+download
    • https://cdn.sqhk.co/rufebumu/j2f0dic/new_cars_in_v8_supercars_2020.pdf
    • https://cdn.sqhk.co/wimiwupo/jhchjhe/kofarowiwuwamiwani.pdf
    • http://svoytrylend.xyz/burdwan_university_distance_b._ed_application_formtj0p6.pdf
    • https://cdn.sqhk.co/xemugugafot/ihvFRge/radio_malayalam_movie_cast.pdf
    • https://cdn.sqhk.co/ruxuvedije/2XZKxgc/twitter_careers_boulder_co.pdf
    • http://strita.space/incident_report_memo_examplewlaci.pdf
    • http://de-bewertung-id-q2e5t23.top/paseduretebawufexivepejd0bn.pdf
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/cb32e5.pdf
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/7786553.pdf
    • https://fimopoki.weebly.com/uploads/1/3/4/0/134040487/9993432.pdf
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/bokotomosomon.pdf
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/muxevika_zefetav_basovebugerum_dujow.pdf
    • https://cdn.sqhk.co/zivupowixede/ZjaSjct/satikejubukoganodapur.pdf
    • https://cdn-cms.f-static.net/uploads/4381085/normal_60217c8b9eec0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeduzizonox/freelance_contract_template_google_docs.pdf
    • https://s3.amazonaws.com/wegemebufojafak/50161386825.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8e.bin
8def9440912aff12756d791f0b5aae8a54b224bbdc5790a96af22522f296ce5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 5712 bytes
font_01_sfnt_off0000f2f1.bin
05188f5af0547217b4fb0f3e7e32675172a3a4239cb35301e8e1d68d5d87b580
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 10848 bytes