Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff52db1d7219fdee…

MALICIOUS

PDF

82.1 KB Created: 2021-02-02 03:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fc924f62824b2d2c41116e1ee50c2f58 SHA-1: 9748e6d1fd677986b70a97af54db9274ce448590 SHA-256: ff52db1d7219fdee0fdb339d5907b13cbcfaa9b1dc7ee82e180ccb1889609013
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, references a "covet fashion dress up game hack apk", indicating a lure to attract downloads or clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/123?utm_term=covet+fashion+dress+up+game+hack+apk PDF link annotation
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/buteguladedadezes.pdfIn PDF document text
    • https://puganijososas.weebly.com/uploads/1/3/1/8/131871778/zigojesedasufam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_5fd63c7436b86.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/7551594.pdfIn PDF document text
    • http://wizomokupelew.iblogger.org/emirates_app_boarding_pass.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/bebusovulutemejeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_600fff58e49ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5fff184635752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418788/normal_600209a18b622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5ffb5fc3d9f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fe9923778b8e.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/bipepezuwed/android_studio_flutter_sdk_path.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/70069232031.pdfIn PDF document text
    • http://moretavumafoge.epizy.com/taco_bell_shredded_chicken_burrito_nutrition_information.pdfIn PDF document text
    • http://favuzokusom.rf.gd/answer_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/tajufosulo.pdfIn PDF document text
    • http://givonomiruf.rf.gd/korean_language_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 5564 bytes
SHA-256: 23c2d45e731fe56246619487e4b05e5755c59e2eda8a994890e86a63510ee58d
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 11156 bytes
SHA-256: 4d7461657d05387d8526e53319ca089a76be827fc6a4c3a6b8f9d808c8ecc4f6
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16060 bytes
SHA-256: a1e2968ca8c7638dd4bef022e186f3fea2b098bc52bbc7b81535a6634822059c

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