Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb4a13669a29b89…

MALICIOUS

PDF

71.0 KB Created: 2021-02-11 09:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6388594e3d54295f88e34de20de6a283 SHA-1: c718d06169e1e564758ee7b9b24036834f754db9 SHA-256: 4bb4a13669a29b897e067cdbb26a89dd0513a0f3443af6a75876aa6f9056ee81
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, including one to 'seumenha.ru' which appears to be part of a link farm designed to attract search engine traffic. The document body, though heavily obfuscated, contains text related to Excel VBA, suggesting a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/aws?utm_term=merge+all+sheets+excel+vba PDF link annotation
    • http://item-mask.top/gabijusdmqdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc82e66eb086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_6000ce6fcfe37.pdfIn PDF document text
    • https://wegabikiwapalev.weebly.com/uploads/1/3/5/9/135992979/vekipi.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/3052933.pdfIn PDF document text
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/9459451.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/wazotojemov/7160486858.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/android_tv_remote_control_gamepad.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/weather_report_sangla_kinnaur_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/bade_bade_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/14685855843.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/sra_corrective_reading_lesson_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/transport_survey_answer_listening.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/teamviewer_10_free_cnet.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/57476538226.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/xovefutowufi.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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 5336 bytes
SHA-256: be268992f6916c296f59c3589f60a7f93be3256b392c84f15cbe7e44039735d2
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 10512 bytes
SHA-256: b98c077102ea212c78d19ebd4880b2d8993a6263c439e6d575cb3ab6fde3dc3a

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