Malicious PDF — malware analysis report

Static analysis result for SHA-256 257429f4083d8148…

MALICIOUS

PDF

89.6 KB Created: 2021-03-10 11:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 106192726d38631f2c0e64c5cf26d757 SHA-1: 5682053f28a19f7e8e64b66f813483cd53541e8b SHA-256: 257429f4083d8148d4337184175f05fdb7578cf50beeffe6795c42c2675915d6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs pointing to suspicious domains, including one that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to a pie chart and authoring application details, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://resalured.ru/wix?keyword=pie+chart+of+world+religions+2020 PDF link annotation
    • http://1s.london/zuzaxwz7o5.pdfIn PDF document text
    • https://tazowodogakog.weebly.com/uploads/1/3/1/4/131437711/kafiguxesulafubij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_60106eb44605b.pdfIn PDF document text
    • http://reduslim-sito.site/boseremofigiwagasovudtn2zx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_5fd90a83016f4.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/4533.pdfIn PDF document text
    • http://sehq.xyz/genuzalejenuxoztu1j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_6045129e28a68.pdfIn PDF document text
    • http://fc-aromat.ru/what_level_ranger_is_aragornybgnz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490752/normal_5ff7ed2091425.pdfIn PDF document text
    • http://mylic.ru/60528084558i91qx.pdfIn PDF document text
    • http://segway-wheelchair.ru/916359935984e0z6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f8b5ee-ae6d-4694-8316-8cdf39784f3c/74701674265.pdfIn PDF document text
    • http://mezexefobotero.epizy.com/gajukopegawedeposijilaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84978152-ed30-4f74-afbe-114b98d38f4f/simple_probability_worksheet_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3342188f-1c4d-4268-8e8c-5f2ebaf0db87/buperuxoderirozo.pdfIn PDF document text
    • http://mogopubu.epizy.com/compound_complex_sentence_lesson_5_answers.pdfIn PDF document text
    • http://vizawog.epizy.com/68254980100.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_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 5652 bytes
SHA-256: 163e112ed41d19b9552ae32fce0c5d92c45114e15179e3aa81ae6ca93cab40ca
font_01_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 13872 bytes
SHA-256: e0e9e3b69214d3c86f2af567d9391705d8f206f6cb77b3800656643424c81950

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