Malicious PDF — malware analysis report

Static analysis result for SHA-256 7863c170621fc254…

MALICIOUS

PDF

76.8 KB Created: 2021-06-01 16:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 279ef57288f28a9224b4a1b334b97bcd SHA-1: 4561b20884902da67ad707a9937ffc636e10c66d SHA-256: 7863c170621fc25428e295f1b34aa59a73402dc565acbe36ffa25f7112c080a5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam, as evidenced by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The embedded URL and the document body, though heavily obfuscated, suggest a lure related to 'Roblox mha codes'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/pbw?utm_term=roblox+mha+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405946/normal_6045c8c016514.pdfIn PDF document text
    • https://losazutuliwuja.weebly.com/uploads/1/3/4/6/134622760/e454a31a6c9894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_60469f2bbf6f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_6020a37ea6b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_605c3c4fe449d.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/mikanuxulabap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481291/normal_6050507217b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_602eb49668022.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/fae39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_60325ee5d889b.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/takeka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fcc591bc3209.pdfIn PDF document text
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/af08876a43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387924/normal_5fef52d78765d.pdfIn PDF document text
    • https://bavarijuni.weebly.com/uploads/1/3/7/5/137503587/98238bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_60461af6ad230.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
    • http://zowonixepor.pbworks.com/f/dewevexumavidox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8bd183-f285-4adc-8f16-a7157d972a59/xalorik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297b8712-0ca0-4d7c-9ed1-5941273ec9fc/gifizekoxijuvisenewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8524ec9b-fbc6-456c-9980-13887a33ab03/jonolowo.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/how_many_species_of_dinosaurs_are_there_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d22eaea-e51a-4eba-ba78-6d23d15d3823/55393656755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49a4fd2-9250-4654-a1b5-a5a21ef29b8c/naxowujur.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/144426513/84776467845.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422991/bahubali_3_movie_download_in_hindi_hd_720p.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/sony_cyber_shot_hx400v_instruction_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 4852 bytes
SHA-256: 2d91ff128c887db2184d2d253903f1e1c65bd735d82214b6f0eb30d0242f63bc
font_01_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 11140 bytes
SHA-256: 64562d30ae5fac62a937f5b850acf54eb1a1751c14c73051b26e6d7e7caca0b8
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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