Malicious PDF — malware analysis report

Static analysis result for SHA-256 57932c59266d3d27…

MALICIOUS

PDF

71.3 KB Created: 2021-02-24 04:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1680fca6cfb95360966eed8999365957 SHA-1: d8e57dbb0470ba8b205ff22d9330bb0a4ffc77aa SHA-256: 57932c59266d3d276b279c3467ec1e528d33bb4833d2d844c3e46231672ab7d2
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is likely used to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL suggests a phishing or social engineering lure, potentially to trick users into downloading further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wb?keyword=guess%20the%20brand%20level%20200 In PDF document text
    • https://cdn.sqhk.co/pogezasamu/iaifUif/traffic_rider_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/ejbgghh/36072976144.pdfIn PDF document text
    • https://cdn.sqhk.co/womelage/ZFqYifL/vinamirapepisutirufuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/xMwshdp/krita_download_italiano_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/tefivezik/itRifje/41215894030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5fd07b9ce4a80.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/GgYDjce/nukogejifufejiwelis.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/Fifhiih/tubidy_music_download_free_mp3_audio_download.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/drj81hd/alien_run_3_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_6022bf21b0208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387054/normal_5fefcf06eae1f.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/iePZgig/97605078575.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/Nhcibjj/smiggle_snake_puzzle_ball_instructions_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/9Rshcgj/african_short_hairstyles_cuts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5fd2d09a5dc02.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/jaijhjj/jamuvasonepubiriketavef.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/dobikasukavu/akhiyan_ch_tu_vasda_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/algebraic_expressions_worksheet_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/8835654359.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/weather_report_new_canaan_ct.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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 5420 bytes
SHA-256: 611ba7fc6fb2c7dd3f4f503715cd9b7230fab5b6609b13a4dd9a26f035713187
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10068 bytes
SHA-256: 467fae5e60457e6d7bd57c3727315cb9c514a19af79dfd860244dc831039b2dc

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