Malicious PDF — malware analysis report

Static analysis result for SHA-256 648cac35733c080d…

MALICIOUS

PDF

79.7 KB Created: 2021-03-12 03:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d98e86ede5a64784ada08968564ff8de SHA-1: 2d9ca28705a883c70eda3845d28d3685ab7065e7 SHA-256: 648cac35733c080d13d97712019d52a235039f62b5c70d088914eb006da702f2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/strik?utm_term=the+island+of+doctor+moreau+movie+1977 PDF link annotation
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/diwed-rusekuboxaza.pdfIn PDF document text
    • https://divowotekek.weebly.com/uploads/1/3/4/7/134759223/7589933.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/7753359.pdfIn PDF document text
    • http://nout-prokat.website/zomabifime4wi3r.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/4586437.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/kakaf_besinirudu.pdfIn PDF document text
    • http://sale-siberian-force.online/jazz_drum_patterns_midinbqkd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ff49de848459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_60346b8383fba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab604c93-5fad-4379-8dd8-07aa2136a1fb/tipos_de_armas_nucleares_y_sus_efectos.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_826137ba7fac42a08f8472161954392c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8a0c0e-8250-484a-99f8-0444e28e4c3e/how_to_use_single_stage_urethane_paint.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_d6eee27ab67c43f4a39f5a2643bc03f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bb7855-f132-4503-a064-0f7a32ac2906/pepamadowopuwopugorupu.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_7ccf202232434a2583111cab0baca184.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/711c8e7d-c515-423a-be30-528f09027bc0/donum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18529c5-e31f-44c3-990a-73a045697c1e/wimiwesujigetuxabewi.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_347117e780da4400b5cf748d3f80c266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13aeec1f-6196-451b-9258-98aa62b71aa6/tom_cruise_jack_reacher_3_izle_trke_dublaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be980dbb-7ccc-4c4e-bdf3-66ccbabae870/45849681403.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_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 5556 bytes
SHA-256: 5e9896e46d9e407eabbd9f8c37e63b8cf3c1ac3c6220c68b15d000f7444eb01d
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 11908 bytes
SHA-256: 8d390f88909b79796e8bb818506cbcc99864fead7f805d797457a98f7593adbc