Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee911fad2718919a…

MALICIOUS

PDF

67.1 KB Created: 2021-01-11 18:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c1e3be2a7f490d4cf67d106f82393af0 SHA-1: 01c3df752ce4ba689dae1f7ca7db4b3bb2de0061 SHA-256: ee911fad2718919aca952c1df942f660f73a4f89b347423eeae67d691025b1e1
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to sheet music, directing users to external URLs like https://trafficel.ru/aws?utm_term=jailhouse+rock+bass+sheet+music. The presence of embedded JavaScript, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the general nature of PDF exploits, suggests it may be used to download and execute further malicious content.

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://trafficel.ru/aws?utm_term=jailhouse+rock+bass+sheet+music PDF link annotation
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/30a41decc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393369/normal_5ffa1f8986645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fa898c93b335.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/lamovenakinuwe-vawatota.pdfIn PDF document text
    • https://kenediroxajomu.weebly.com/uploads/1/3/4/4/134440197/02835bafa3.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/6364408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5fefd665ac984.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/261e0db.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/gejitopomugumolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5f9205be17afd.pdfIn PDF document text
    • https://bugalesatu.weebly.com/uploads/1/3/4/3/134309104/ledomiburosad_vefodezero_petenow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488116/normal_5fcbcc15b77d0.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/vavapekadoliti/minority_report_2002_vietsub.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/t_shirt_design_size_template.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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 5232 bytes
SHA-256: 8a39a53249f8129fb0324179be9257ebaa66cda4b7d357dc7d80a9a350753142
font_01_sfnt_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 11032 bytes
SHA-256: c50f60c84dda18b4eb9f864293ff05c60f82ad735a2e6d1efd4ac94154fa9b2e

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