Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af39e01c2b5dc66…

MALICIOUS

PDF

81.8 KB Created: 2021-03-21 03:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88d490b17068d05828a23987c92f134d SHA-1: ef708f243bb769581723216c6e62b94218ec8671 SHA-256: 7af39e01c2b5dc669a4a4bccf864ab8b63e1f3ee79f9381f646039f70b17de2e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of external URIs and the overall structure indicate an attempt to direct the user to external content, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-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://druttle.ru/wix?keyword=kyrie+from+pope+marcellus+mass+genre
    • http://bozifosituv.iblogger.org/51538554085.pdf
    • http://agreevudb.rest/16108876684pbfn2.pdf
    • http://vukuradi.mygamesonline.org/ps4_gta_5_code.pdf
    • http://jewlgems.com/5234990974534hax.pdf
    • http://useplafond.xyz/45932854449i9rnf.pdf
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/mevuzuko.pdf
    • https://pifonexivusefeg.weebly.com/uploads/1/3/1/0/131070190/dusajamoreda_vasubuluvulufe.pdf
    • http://forexgeeks.net/63191263623k753g.pdf
    • http://werikipirojenob.scienceontheweb.net/canard_enchaine_download.pdf
    • https://lamamamim.weebly.com/uploads/1/3/1/6/131606140/1542472.pdf
    • http://xufamorazogubov.sportsontheweb.net/vudakomidojazapukevukito.pdf
    • https://nunuwipan.weebly.com/uploads/1/3/6/0/136002942/9902051.pdf
    • http://gekifek.scienceontheweb.net/kinefis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sojebelevenex/27419585371.pdf
    • https://s3.amazonaws.com/xofalepelala/what_is_critical_reading.pdf
    • https://s3.amazonaws.com/jezaxojipevu/dizejobawusolodimuxowotez.pdf
    • https://s3.amazonaws.com/xoferuzu/wobopurumakekufulofonoma.pdf
    • http://nezenomawaza.epizy.com/zesikagubodusum.pdf
    • https://s3.amazonaws.com/bajapovogam/ixl_answers_7th_grade_math.pdf
    • http://kipazafar.atwebpages.com/biblia_latinoamericana_san_pablo.pdf
    • https://s3.amazonaws.com/gavobawum/android_view_background_color_gradient.pdf
    • https://s3.amazonaws.com/baxegezivumi/edhesive_unit_3_quiz_1_answers.pdf
    • https://s3.amazonaws.com/rurosaveruk/gestational_sac_formation.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_off0001037d.bin
396f90286b53ea57620ad876bc93e8b3574c9c9f32ab14ad7ed9af366d442653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 5408 bytes
font_01_sfnt_off000115e0.bin
c68e5ac1079cc2e5a3f5bfd40ffdb3e75f3afd86dfb4072ccb2df89d86f3d180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10512 bytes

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