Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04ebd83d86e14f4…

MALICIOUS

PDF

88.8 KB Created: 2021-05-13 01:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6cf0d052cfebdc53fbba8eaddb7ed7a4 SHA-1: d43f2d916f72d3685f3a3e7dd90bbaf21f60312e SHA-256: c04ebd83d86e14f495a1f968ebca890c18aa6d42565eb8c61d1407358833f543
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+install+netgear+powerline+1200 PDF link annotation
    • https://cdn.sqhk.co/nurijodefa/nja98Er/poppy_cartoon_trolls.pdfIn PDF document text
    • https://duzamalati.weebly.com/uploads/1/3/5/9/135986709/07afc.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/jfBgjja/balenciaga_triple_s_white_womens_37.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/ragiba.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/lulosop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_604cc781657ca.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/jfUhdUa/property_for_sale_in_the_caribbean_islands.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/mipogevav.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/nhc8hjC/ilearn_numbers_counting_for_preschoolers.pdfIn PDF document text
    • https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/dikeladisamijirala.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/EggmhgW/tic_tac_toe_strategy_pick_3.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/whdojfs/los_sims_freeplay_hack_ios_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_604ef94592fa9.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/d89fc94d0e2.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/HkmIVie/airline_tycoon_2_geld_cheats_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_5fe9f6c61f9f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_601ae5ef7e52b.pdfIn PDF document text
    • https://cdn.sqhk.co/sexifirume/ej6jbM3/83778940712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_31d105556ea646f1989442100a501203.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_7d79ab161b254241bb5d85e89e72709c.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_bed50cb2d9ec4bf2854e02f480b94e89.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 5368 bytes
SHA-256: 23ed666bb39ca7a364f1fad289029e1d790859586d29e7c8e6de22b4fb94a04b
font_01_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 10920 bytes
SHA-256: e6052d8c5bac5a77eb80d449c7293a7bf8abd1d18a2c0ed5d7a27c68bc1c9728
font_02_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67