Malicious PDF — malware analysis report

Static analysis result for SHA-256 8153c3d154b3491a…

MALICIOUS

PDF

67.9 KB Created: 2021-03-07 06:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b94461b25a593a95ac733095cafa8fe4 SHA-1: c4f654b693a994852a57defa972c66d78960bf0b SHA-256: 8153c3d154b3491ad4c55231d1622846c14bfdaef9fa4d28b5b5c01cf7bb5fc3
156 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. It contains a large number of external links, many of which point to other PDF files hosted on potentially malicious domains, indicating a link farm for SEO manipulation. One of the embedded URLs, 'https://mezovuduw.ru/wix?keyword=eider+duck+call+ringtone', is a primary indicator of the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://mezovuduw.ru/wix?keyword=eider+duck+call+ringtone PDF link annotation
    • http://toxipoxekej.medianewsonline.com/43717165409.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/is_rosetta_stone_app_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_60390814e22eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_6025845e483e3.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/ninjutsu_techniques_free_download.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/facebook_recover_password_without_resetting.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/monique_and_the_mango_rains_chapter_2_summary.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/sezebepit/what_is_mdmp_file_in_sql_server.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_82bb9b2bac0049389ff75de0275cb203.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_a3357806b5a44676b500a6391bfff083.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/latanalunoxezewemeki.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/ios_13_public_beta_ipsw.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/kewutukinuruwujut.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_8a686e9adf11431f89842aff79deb076.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/75151357770.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/buzofuloxutixomeb.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/how_to_open_drain_valve_on_bradford_white_water_heater.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_b0bc1f1c22f745058f900ae588185027.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/fatonajuzofos.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/introduction_to_academic_writing_vk.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/performance_appraisal_goals_examples_for_managers.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_3724d4970f0c40c887a824de86e1bba9.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4fe2817437c440d5bc1e1f96db70a18b.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_f730d0609db544b2b3cb31bbe9f57d4e.pdf?index=trueIn 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_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 4948 bytes
SHA-256: 11847d17f421a963443f3c127d8d30abfdfb9ac31cbd4a6a1856978a06e9ec94
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 10072 bytes
SHA-256: 293cd4748e77592cae0d9bccb2d185ea15b2ab95b82a66b33d9cdfe5df8545af

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