Malicious PDF — malware analysis report

Static analysis result for SHA-256 482658612671e72f…

MALICIOUS

PDF

79.9 KB Created: 2021-03-18 07:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 937cc81fa059a1c788ab51b7cd364aa5 SHA-1: 2fcedefa727cc29c532330e7a0808a4857c85066 SHA-256: 482658612671e72f12cab32c2de3a8a3dfb6639652a29fef3fd402886a779e4b
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 by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs, including suspicious domains like dugedepap.ru and leadtop.co, points towards an attempt to redirect users to malicious content, likely for phishing or SEO spam.

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/wix?keyword=old+paris+flea+market+grillz PDF link annotation
    • http://leadtop.co/how_to_send_garageband_file_to_emailc18nv.pdfIn PDF document text
    • http://docita.fun/the_rocks_cry_out_meaningmx7el.pdfIn PDF document text
    • http://amst-watch-v1.club/31364453499xyie1.pdfIn PDF document text
    • http://knitfqph.site/15011592049xxnn7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_600a2895ad145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_5fc5d3f99268d.pdfIn PDF document text
    • http://websecurer.tech/one_punch_man_anime_or_mangaoawcr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f3a076a6-3dab-4f96-a567-4379e9b2a2ae/77186145358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f467b91a-1a6c-4409-8e0c-935068b5cc8d/fizetanuxalotuzetasi.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_01f73ae99cec4b30ab21daf0f24308b6.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_16b3df018ea14169abc124491bbc961f.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_52741139304e477fb5982030f6b5d3c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e193321-fcab-4c33-b1a4-60edca6534dc/43117391041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3417c1af-c74c-4cae-881d-d38fbdc1e403/the_arrl_ham_radio_license_manual_4th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286ceb57-0a02-4bad-a619-77fe588254f9/83905099476.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_6906224bc53942179298a03357fd7824.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_d4a642f181874a329298606da1f3154c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cbad96-cd6a-49df-8f69-2b96d47824c9/walmart_black_friday_88.00_tv_deals.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_9a6268cddce34fd2a6eeb01617d561bc.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 5072 bytes
SHA-256: 4f650788b5aabea3576af99df7491de85ac637d66abbfe8e70fd670c06efb984
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10856 bytes
SHA-256: 31a8d77f2cf8a8d084e0e5640d856e3bdb575a2a41a8b8120601b9bff600cbff
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2