Malicious PDF — malware analysis report

Static analysis result for SHA-256 66112b9c8251a870…

MALICIOUS

PDF

77.5 KB Created: 2021-01-20 12:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1038574dcb05e0c1ddcbbead54b8e326 SHA-1: ae27ff72c3a6cf292731214d82523c42a3e4ade4 SHA-256: 66112b9c8251a87091be6bd3d986f81ee5a3e5b3c39a0d6dd311c1725e1091f3
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL and document body suggest a lure related to 'private message pro apk', indicating a phishing attempt to trick users into downloading a malicious application. While no scripts were explicitly extracted, the PDF structure and malicious classification point towards an exploit or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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
  • 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://seumenha.ru/aws?utm_term=private+message+pro+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393502/normal_600114a352765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5fdb2796bc323.pdfIn PDF document text
    • https://site-1173675.mozfiles.com/files/1173675/ligulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5feed69bafab0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390641/normal_5ff7085a1a0af.pdfIn PDF document text
    • https://site-1178709.mozfiles.com/files/1178709/bangla_cartoon_thakurmar_jhuli_free.pdfIn PDF document text
    • https://site-1171990.mozfiles.com/files/1171990/xerukafomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444104/normal_5ff036c027059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_5fac34f5489b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463006/normal_5fb2dd1d69a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fd137f48e94b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/murudute/free_antivirus_for_apple_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/donation_app_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/wesoved.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/gate_2018_instrumentation_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/81222050771.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/armitage_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/vitur.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 5232 bytes
SHA-256: a94a0e9d8e72cdc1f4478de1ea926f67214d2f564c3aeb39d24f82141f4446d1
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 11904 bytes
SHA-256: 132dbcdcc1ac4c05ee78753213fa1d80f75feb365cf3ed0e5f2c4aea2b58f472
font_02_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 16340 bytes
SHA-256: 57c1ae502b16ce7513a26401cb856616461376491e5bbf94150e6aafede89f76

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