Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30449094cc68d4b…

MALICIOUS

PDF

73.8 KB Created: 2021-05-03 11:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 957ab44d50431bc9f853c56eb21b93ae SHA-1: faf0e18e817d08e0f3e53be76a0452f97ea3ad63 SHA-256: c30449094cc68d4b5ec05440c42184dc3a2c0f43d09e881a82babcb5c25c50f5
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 domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=vicks+cool+mist+humidifier+filter+free+reviews PDF link annotation
    • https://jegetujo.weebly.com/uploads/1/3/5/3/135300600/fixevuxakanupuguw.pdfIn PDF document text
    • https://zibamikalizofu.weebly.com/uploads/1/3/1/4/131409526/rapaxu-vikiromim-dufel.pdfIn PDF document text
    • https://fuvedomuwipiw.weebly.com/uploads/1/3/1/6/131636935/dufosimages-novuzanorugixep-nukasusixame.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/9354777.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/82014813549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_1238bd7f757c4a39a122a1176c1a239f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a616fc-4b48-4d8e-b766-e60a0910a05a/circuit_analysis_and_design_uts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1505401-9e66-4c4e-95de-d611c4a39e33/dedafinosidiwomupotiw.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/gazijapebidewipisogat.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_ba668f0e69d54011b7bdbade1159361a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84b8548-144d-4300-9c3f-851c87bdeb2c/grade_1_math_worksheets_addition_and_subtraction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bbf122-4b8c-410b-b903-6a5c3acde924/xojad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0fe64c-8bf3-4441-a822-4a266632411d/52547955033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2290af-6b90-428c-b8ea-aca1656f4738/dsc_pc1832_kit.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_b666ea410a1c4cfcaa45540c5937b316.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/994e6a1f-151c-423c-8e0f-688bd714f692/nisinosujugidaniwidav.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_cc6992ad41404dc89b01b6073055fce9.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_bc77b53b5447408dbdf6ef77dce14b32.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_1b72d7742b514f149d611be759358eb7.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_c0a1da3cb1b04894b4e27d883cfbc347.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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 5232 bytes
SHA-256: 0f6b2c4ade30384759ab39d032262e154c7d51086a63f30c2f789330459b6948
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 11644 bytes
SHA-256: cd6030243ca591c33acd7101508c6f61ec853a2781230e4154e1d0f7450a3b7b