Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f1c5fc611e6357…

MALICIOUS

PDF

79.9 KB Created: 2021-03-22 14:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc5112552303ad1cc539cf9b9381c4b0 SHA-1: b26568168bd419634f332383cdb7f859246778df SHA-256: c8f1c5fc611e6357dab1f109d20b2e6843c5a9c7d6901cb3a5382b7f7ea63c5a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a deliberate effort to create a network of redirecting URLs. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/123?utm_term=michelin+guide+san+francisco+bay+area PDF link annotation
    • https://derimazigazudi.weebly.com/uploads/1/3/4/1/134131427/6546427.pdfIn PDF document text
    • https://xediziku.weebly.com/uploads/1/3/1/3/131384396/gugotakivomu.pdfIn PDF document text
    • http://websecurer.tech/45132519819jsrwv.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/3835506.pdfIn PDF document text
    • http://8gusevshop.website/328394376419ue0x.pdfIn PDF document text
    • http://vas-rem.ru/58333773174wukfw.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/8tGJgjl/xamolenonenaw.pdfIn PDF document text
    • https://buvelixajotoneb.weebly.com/uploads/1/3/5/9/135982000/sojoduxegu.pdfIn PDF document text
    • http://fakaripeti.xyz/motorola_verve_buds_200_instructionsfpqq1.pdfIn PDF document text
    • https://vixezijimike.weebly.com/uploads/1/3/5/9/135993975/5225062.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/hezjh3K/funny_prank_call_numbers_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/cgfF3gg/best_photo_editing_app_free_android.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/kojukuxiwinirotal.pdfIn PDF document text
    • http://batmbatm.ru/what_does_structural_frame_mean_in_artwrwjq.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/i2zgcwN/total_conquest_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee809a51-a58d-41df-a269-13688c4e1c69.filesusr.com/ugd/5f587b_f224b2f3f5c04884a41d116aa305288b.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_a208ab31ec4644e98c8eeee8d3492395.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_3d0c7f7f40134747869598139eb4aec7.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_79409c4f90ea4c06a6eb51f37f145732.pdf?index=trueIn PDF document text
    • https://ae40ec61-d20a-40a8-9c94-208d4569f534.filesusr.com/ugd/5d0862_5b09b5ecc612433d8eef3a36c7204f70.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_4c1123582ad94712bc4391eabf22aa21.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_f51160f77ad4453f8d68a23c7c6e50f5.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_ec01471b727e42e88ee3eab2cb8acc49.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5528 bytes
SHA-256: 055c6fe1adc47c642a096caf17192f2e07ae2d24ea79e207bc653ffe7e051045
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 12032 bytes
SHA-256: 8a7d9a30c264ea9b9f4018f53fec4a8edf2384bbc71a922bb1b5e8b3fbd7daed