Malicious PDF — malware analysis report

Static analysis result for SHA-256 0816d8df8573752c…

MALICIOUS

PDF

72.2 KB Created: 2021-03-14 05:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00a4475a9aa3887c31a7dbc88b7cd646 SHA-1: 7c7ff19e8f0e99c7def1731dcf3c3efc789be6c3 SHA-256: 0816d8df8573752c9b794c0764adda5eb8c2bba949282ebc914585084af2944d
96 Risk Score

Malware Insights

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

The file is a malicious PDF detected by ClamAV and an ML classifier, exhibiting characteristics of phishing. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a payload or redirect the user. The document body, though heavily obfuscated, suggests a lure related to 'Free basics facebook apk'. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=free+basics+facebook+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365580/normal_604d5b42dc990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600a507857f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5ff52c8646823.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/19529123686.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/how_to_calculate_payback_time_in_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_6026e7e789ae8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevikawimal.epizy.com/dabalajunotekazegudatedob.pdfIn PDF document text
    • https://c8ba229c-4323-4b90-a5d7-a8d36124f6f5.filesusr.com/ugd/c068f8_75d54afcc2d74be2bcb75a90a4d89531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/rogeki.pdfIn PDF document text
    • http://xejojud.epizy.com/wilofaxim.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_6f5cdd38327548a28e8214ca380f2419.pdf?index=trueIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_fe628916c80b42a8b40c42b956ecbbda.pdf?index=trueIn PDF document text
    • http://voniziveput.rf.gd/how_to_become_a_certified_medical_translator_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/aws_certified_cloud_practitioner_study_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/responsive_art_gallery_website_templates_free.pdfIn PDF document text
    • http://jinibelirakime.rf.gd/nakukosizokude.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/birthday_wishes_song_for_brother_free.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/jedijinoxifijaxazajam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 5136 bytes
SHA-256: d5dbf45df9b1c185ad4eac05c74c2225fda9b125161dcdb5d0e0b059590c75dd
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 11240 bytes
SHA-256: be09216ad281a63bb35e82ae9b81f3a3463ff72a9d96c20b23c166afe4db63f9

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