Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea551b92894b8cd6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 23:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10988859248a18445ce94e92ade9da3 SHA-1: c3af74fe6b398735445f9512f56da86a655f20ee SHA-256: ea551b92894b8cd6766d0185a2e465629c05e582a8770a61343d01eb6abf21ff
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to sheet music and PDF, aligning with the lure. The presence of external URIs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6900

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vilenefex.ru/award?keyword=berceuse+sheet+music+pdf
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fee6df780d60.pdf
    • https://cdn-cms.f-static.net/uploads/4476578/normal_601fe104da361.pdf
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5feb1a30ba59a.pdf
    • http://kexedeziferu.sportsontheweb.net/why_does_my_mains_powered_smoke_alarm_keep_beeping.pdf
    • https://cdn-cms.f-static.net/uploads/4406168/normal_603a1cc9c7455.pdf
    • http://nomudepalak.medianewsonline.com/solenoide_libro.pdf
    • https://cdn-cms.f-static.net/uploads/4402481/normal_603281e5d75f0.pdf
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/zukamufozig-gixonibakiros-faxuda.pdf
    • http://kigalasabipigo.medianewsonline.com/18615622031.pdf
    • https://wefigoga.weebly.com/uploads/1/3/4/0/134041661/fakopuwupopataz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bifadiwuwileji/91556597574.pdf
    • http://tipipigi.atwebpages.com/kogaf.pdf
    • https://s3.amazonaws.com/jolunenafobuw/75803939230.pdf
    • https://s3.amazonaws.com/vebogotexaf/street_fighter_zero_2_apk.pdf
    • https://s3.amazonaws.com/povelenavuviw/wituwisutoras.pdf
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_4b325ed3281643fa86b320d5e640f7c8.pdf?index=true
    • http://bagugexasorip.myartsonline.com/nezigufilomap.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/how_to_punch_a_punching_bag_properly.pdf
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_972e2f1758f0414db1e5dd7c957ff6f7.pdf?index=true
    • https://s3.amazonaws.com/geraromu/adding_and_subtracting_integers_worksheets_grade_6.pdf
    • https://s3.amazonaws.com/resabomibogodaw/star_wars_encyclopedia_of_starfighters_and_other_vehicles_free.pdf
    • https://s3.amazonaws.com/gazitif/81273597553.pdf
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_ff4f35d54fdd47238d4fa758d508efc1.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_7629ee016bd8402796b28481043e492a.pdf?index=true
    • https://s3.amazonaws.com/vovabagubajegeb/newtons_1_law_of_motion_wikipedia.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc3.bin
d0bbc81d65cfe3d8da259bf76844c67cbd1dec970154bd5c06275d4f570355c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 4868 bytes
font_01_sfnt_off0000fe5a.bin
b47e7c6381746a88c3397bc768691d3af28cde1d47e7a725e3ff81f656bef71a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 10704 bytes
font_02_sfnt_off000122fa.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 4324 bytes

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