Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba137ea9f5a714d8…

MALICIOUS

PDF

74.2 KB Created: 2021-02-19 07:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1b0097716f443094240ce4645ded2e58 SHA-1: 32e46620695595314b44fa9d469d011ff92d9cd9 SHA-256: ba137ea9f5a714d8087d63b4c49542e843b2b0398697e074c9478613106faabf
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 flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to financial calculations, which is a common tactic for phishing or scam operations.

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://crophysi.ru/123?utm_term=how+to+calculate+interest+due+in+excel PDF link annotation
    • http://wumofuzusagumo.22web.org/tokyo_ghoul_anime_age_rating.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_5ff9026c6b4cf.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/91786e7.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/wijoxivonim-jexekipanod-jubewabibeloxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ff409ab66663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408187/normal_5ff90e240802c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_5fe6ad70d965f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fd63fcc83921.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/9864358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_5fdc05b3dbfad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498883/normal_6005b53c68ffe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481272/normal_5ff446cf2f824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_6014367944aad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401545/normal_5fc6bb415941c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6012814cb6567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_600d6e7868c75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5fc8bb06890b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejemerane.epizy.com/makuguzatozuvisib.pdfIn PDF document text
    • http://fijetetesozaw.epizy.com/gitefotolukulekirufi.pdfIn PDF document text
    • http://perepidowowavam.epizy.com/is_200_basic_incident_command_system_answers.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_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 5056 bytes
SHA-256: 5cca0b168088210b3dd0901ee8c315b8ddce373b8e8d7f25da3f8a3794a2a574
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 11232 bytes
SHA-256: ee33bc59462404529eb7a437b411e5a75457e0d04e428194d5ad293496920142

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