Malicious PDF — malware analysis report

Static analysis result for SHA-256 e887894b816b68c3…

MALICIOUS

PDF

73.6 KB Created: 2021-02-18 06:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 20de8e86a0aac08c7c1418fc4b7cfacb SHA-1: b562d8caeced212791cd5ca2f268306fbc46ebbf SHA-256: e887894b816b68c39c98a48b011106641794e58aa9eee07c04ad10cd84147b39
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The presence of multiple suspicious URLs and the ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/aws?utm_term=without+conscience+hare PDF link annotation
    • https://cdn.sqhk.co/xozirijor/bJtDhg6/filosexakune.pdfIn PDF document text
    • http://ziponep.22web.org/himouto_umaru-_chan_parents_guide.pdfIn PDF document text
    • http://sale20.site/harp_music_sheets_for_beginners7q8pl.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/Yhajhgf/beripusiguxosovu.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/ibhjGjb/interstellar_2008_script.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/8533698.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/mutuwexibiz_fuluvagaxavo_paxadapuweladet.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/dd5cd.pdfIn PDF document text
    • https://cdn.sqhk.co/bizifabov/JjdEij7/47814856176.pdfIn PDF document text
    • http://togurebuk.66ghz.com/dadetunoxomoruvo.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/5452292.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/zTFjhgh/in_dna_cytosine_always_pairs_with.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warodisomadux.epizy.com/beauty_selfie_app_free.pdfIn PDF document text
    • http://xanatilaguweve.epizy.com/excel_flight_itinerary_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/vapisadedo.pdfIn PDF document text
    • http://vipojidetag.epizy.com/cdr_king_router_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 4868 bytes
SHA-256: 494782c83ff6bb231a68db75a13d70109d486ce84aaa73ea7a0c74be795479fd
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 10752 bytes
SHA-256: fdb94f26e98cf98847dc3c369a16a5e88105889abea2688829aa70f5d332571d

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