Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad88f57bb3b2eb3…

MALICIOUS

PDF

73.8 KB Created: 2021-02-21 09:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f0adabd4f8acfffc4ee60c9e2edb215d SHA-1: 9447b3df61a3e5d5a40ed15008edfee77fc0964d SHA-256: bad88f57bb3b2eb395d768b3af74506f00c7e97d32d39d4a905e9f7fef5c9e7d
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/strik'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to search queries, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=how+do+you+cite+multiple+authors+in+chicago+style In PDF document text
    • http://nivakagudan.22web.org/87937863989.pdfIn PDF document text
    • https://cdn.sqhk.co/tajavujexiz/37dQc1O/i_wish_you_were_here_too_in_spanish.pdfIn PDF document text
    • http://denizan.com/digemupiwebomojuvin9iv.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/aPNhggc/xuwebezafesulapetulaga.pdfIn PDF document text
    • http://logusubunovad.22web.org/which_book_is_best_for_maths_iit_jee.pdfIn PDF document text
    • http://topmassage.net/subjunctive_mood_worksheetzxs11.pdfIn PDF document text
    • http://itawomen.fun/885233018254ydkd.pdfIn PDF document text
    • https://cdn.sqhk.co/nosilaxuziz/jiuuXgi/sozunasanezunaje.pdfIn PDF document text
    • http://kemotunitajifap.iblogger.org/apowersoft_video_capture_portable.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/toniseligiwuzux/advanced_scientific_calculator_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/beginner_guitar_reading_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/kewigeb.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/always_on_display_pro_apk_2019.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/equations_of_lines_worksheet_answers.pdfIn PDF document text
    • http://sufapanizesemot.epizy.com/ardab_mutiyaran_movie_song.pdfIn PDF document text
    • http://zozujuzozupu.rf.gd/49526450189.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/glencoe_health_answer_key_chapter_4.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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 5644 bytes
SHA-256: 1d83d087809b550175c96e8300d5c35274715f478318418ab33abb69e21c7b5a
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 10600 bytes
SHA-256: d9a11250a5f1fcfc74d28413f29949f5ff244ebac1681ac1a40e83143331557f

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