Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b74432be4ee88a…

MALICIOUS

PDF

119.1 KB Created: 2021-03-15 00:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe8a960c70ffa109656d3e97da08642e SHA-1: 21d15c040a0d586aba92004985f634e8843ef3ea SHA-256: f5b74432be4ee88a92dc4565ae39081c9e34bad244700e044df4a03cff6cd87a
96 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 an embedded URI pointing to 'maypoin.ru', which is highly suspicious. The document body, though heavily obfuscated, suggests a pretext of providing a 'sample letter to hoa board of directors' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=sample+letter+to+hoa+board+of+directors
    • https://cdn-cms.f-static.net/uploads/4379237/normal_602bb0ca26a6c.pdf
    • http://hamsterbig.com/40862782827p725v.pdf
    • https://static.s123-cdn-static.com/uploads/4380859/normal_5fe3b65910293.pdf
    • http://dovulup.iblogger.org/inferential_comprehension_worksheets_year_7.pdf
    • http://tk-pobeda.site/lodimebewawelixijutgrgo4.pdf
    • https://cdn-cms.f-static.net/uploads/4427783/normal_604826f5bf5de.pdf
    • https://cdn-cms.f-static.net/uploads/4369919/normal_601dcda0a3b7c.pdf
    • https://cdn-cms.f-static.net/uploads/4454691/normal_6023cb3bdbfbe.pdf
    • http://shopwithsale.website/what_is_nationalism_in_india_in_hindifh958.pdf
    • http://itclick.pro/31808390895vsxqy.pdf
    • http://winoorama.site/55756681439iq7ml.pdf
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5fc731e77a653.pdf
    • http://fosufupivufup.66ghz.com/centos_6_64_bit_server.pdf
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5fffcbd642387.pdf
    • http://logmeinnow.xyz/23714870314ento9.pdf
    • http://chambrehq.xyz/viwumuvexufugakaliroddoxky.pdf
    • http://shtangye.xyz/89749587785sp32l.pdf
    • https://cdn-cms.f-static.net/uploads/4369647/normal_6016214042d6e.pdf
    • http://mysteps.online/5813776284h2bqf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/992bf84a-5e05-42ce-97b9-8ab3070628e9/how_to_wear_gas_mask.pdf
    • https://uploads.strikinglycdn.com/files/54b89b30-5583-4fc8-b9c1-45f64342dbcf/odessa_file_ny_obituaries.pdf
    • https://uploads.strikinglycdn.com/files/34787b83-bdb1-448e-8b8b-3398c35c6805/xudebawexope.pdf
    • https://uploads.strikinglycdn.com/files/b5e2dd5f-6773-4ef2-926b-92f750773921/what_happened_to_noah_in_the_raven_king.pdf
    • http://tudegelufer.rf.gd/solajurotuzobozo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001939c.bin
a9332786289717f93e3a2c037793e828a227b9abe8a28ed7d09fd2c95d389afa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1939C 5636 bytes
font_01_sfnt_off0001a692.bin
1ebef2d0de2b23f0e224042dc01ba11d3c10d9f50deb9554346251cd3d3d23d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A692 11852 bytes