Malicious PDF — malware analysis report

Static analysis result for SHA-256 892de60f7efc98a9…

MALICIOUS

PDF

66.8 KB Created: 2021-03-11 15:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f3a089fbd75e0cd92145a1fa343a0d43 SHA-1: 860842b676336bb04b1c372ce96379691e1afba3 SHA-256: 892de60f7efc98a9f2ae7859e5357c654529a8375f621a3948943d7829011ff0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, with the embedded links likely serving as the primary attack vector. The file's content, though heavily obfuscated, appears to be related to a certificate template, a common lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://resalured.ru/123?utm_term=certificate+of+appreciation+template+microsoft+word PDF link annotation
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/mexigo.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/daa2be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497685/normal_600718002f55f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5fffe1068139e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe1cef684bde.pdfIn PDF document text
    • https://zunemugegixado.weebly.com/uploads/1/3/4/6/134698728/d0c5a5df45b297.pdfIn PDF document text
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/5910961.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/zewivibonog.pdfIn PDF document text
    • http://xagekofa.iblogger.org/predica_sobre_el_dador_alegre.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/kuletub_vabituf.pdfIn PDF document text
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/af8f47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_601e115970c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_60120d113a37e.pdfIn PDF document text
    • https://vubibawijov.weebly.com/uploads/1/3/0/7/130776162/25e074.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/sawubelujele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_6006c51176b5d.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/2565637.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/dadupawo/bajrangbali_song_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/57526412528.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/32794129601.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/minority_report_short_story_vs_movie.pdfIn PDF document text
    • http://lozopavo.rf.gd/yii2_basic_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/more_apple_watch_faces.pdfIn PDF document text
    • http://kotidaw.epizy.com/30250685310.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 5296 bytes
SHA-256: 53d3d8d14ac6e240a2c12cf293631391602c886cdaa8e517394f74df084f0042
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 9856 bytes
SHA-256: fef3473c3c0d51fbd777a7fc3870f8186d334ae38d0a4ad7c8d7ab96568a4e2a

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