Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f3d941135f25c2…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 19:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bc83583813954588d69c5d042f0d3606 SHA-1: 91f1058957ee1e2b16984e4d4bc642b3b0ae43c6 SHA-256: 96f3d941135f25c28e889881aa786e3e4bbba171aad7bcf387166337f0c54a36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of unknown reputation URLs strongly indicate a phishing or malicious redirection attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=3d+animation+maker+free+download+full+version PDF link annotation
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/71b007d83.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/gotanikewezym08f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5fe75f4f170f9.pdfIn PDF document text
    • http://kungfumalibu.com/chng_trai_nude_vi_nhauh0ojf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_6018cb7a28d51.pdfIn PDF document text
    • http://sushibara.net/hp_laserjet_p1102_toner_cartridge_price_in_bangladeshtxpwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6029c38e8a365.pdfIn PDF document text
    • http://onatural.space/go_way_from_my_window_sheet_music36wrz.pdfIn PDF document text
    • http://orbitan.fun/21849003692ceams.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5ff459d497233.pdfIn PDF document text
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/18cdda4f8a75e2.pdfIn PDF document text
    • http://reduslim-shop.site/13849243641n8c1b.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/kanopixa.pdfIn PDF document text
    • http://nikecortez.net/beliefs_of_salvation_armydigng.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_5ff1b815388ac.pdfIn PDF document text
    • http://tophomework.space/hitachi_nt65ma4_angled_finish_nailer_with_air_dusterw8fxb.pdfIn PDF document text
    • http://svoydvalend.xyz/mebogullqo8s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozore/85445600473.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/castleford_academy_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/fbi_physical_fitness_test_scoring_scale.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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 5340 bytes
SHA-256: 2c0a452cf6c9aab5a1c7f81d9f1c074d9d8bc8c5f15daa5f9f00f60694d89ca3
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 20692 bytes
SHA-256: c87852bc5f79dcd4f073d0a683b8c54e8fea2b5fb227465dd633a881e4eaa287

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