Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e633028027a8a4…

MALICIOUS

PDF

82.4 KB Created: 2021-02-14 09:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 68bb3d58025f4a64fa02d16772c41034 SHA-1: e4a48f30f976166609d8a575fb607d743c5d7335 SHA-256: 81e633028027a8a4c6213b3b62a199365a90f6586813672c0a11052b39a5288e
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Bridal emoji pictionary game answers', likely a pretext to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://leonvi.ru/aws?utm_term=bridal+emoji+pictionary+game+answers PDF link annotation
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/9355782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fe7dd6425afb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471484/normal_5ff8b22dcc967.pdfIn PDF document text
    • http://fly-drive.online/projet_de_loi_de_finances_2020_maroc0eesh.pdfIn PDF document text
    • https://firupafawaxif.weebly.com/uploads/1/3/4/1/134109114/6282210.pdfIn PDF document text
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/dumozudav-zowunonusaj-fewus-kamodi.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/zawakezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_6014a15b49215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5ffe493ccea87.pdfIn PDF document text
    • http://youtube-subscribes.com/chakram_telugu_movie_songs_naa_songsdcp51.pdfIn PDF document text
    • http://blog-millionaire.buzz/regal_academy_fairy_tale_pop_20hobh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://soxowanukaf.epizy.com/apache_server_for_windows_8.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/38780350457.pdfIn PDF document text
    • http://xedaxabefax.rf.gd/zapoto.pdfIn PDF document text
    • http://mefinuxewo.epizy.com/army_cadet_uniform_standards.pdfIn PDF document text
    • http://lipewax.rf.gd/iupac_nomenclature_practice_exercises_with_answers.pdfIn PDF document text
    • http://revilika.epizy.com/dell_server_r540_datasheet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 5500 bytes
SHA-256: bd3ef3115c6fc2a59ea185a73b3918f34fc564cdb3a9f69f49149188566caa65
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 5936 bytes
SHA-256: b118dcfe0e15759ae37fbb27c9a7d02e6cccc225dc3bb067f679c7ffe94c4e52
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 10820 bytes
SHA-256: 43b6efa29fa41051d2f0f7862472ec6d68220ebf671c863b5ebc7be50f724f28
font_03_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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