Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdba43660b822430…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 16:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 36e6014116b450e70b4cfb97600544e4 SHA-1: 372d78ffc237a7528c5096cf174945e319449e54 SHA-256: cdba43660b82243032ebb0e0bdc7439bad69b68edf62665a5ce251c916394d3a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=why+is+water+coming+from+my+overflow+pipe PDF link annotation
    • http://penibibujobufux.iblogger.org/31218318666.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/m75dicX/used_cafe_racer_for_sale_los_angeles.pdfIn PDF document text
    • http://zupedaganivo.66ghz.com/flightradar24_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/EGqhhBb/army_wallpaper_iphone_6_black.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08142051-8e1e-4d11-bdd8-596e1f491f78/chet_atkins_wheels_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3b0e33-67e7-4a8b-bb88-b58941c9cb60/what_does_the_clean_button_on_mr_coffee_do.pdfIn PDF document text
    • http://babirusup.epizy.com/89670408130.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/model_3_long_range_base_performance.pdfIn PDF document text
    • http://nonosolagosev.epizy.com/87473840907.pdfIn PDF document text
    • http://taparuwuxos.rf.gd/makro_catalogue_march_2020.pdfIn PDF document text
    • http://pezomovororiz.rf.gd/68174381698.pdfIn PDF document text
    • http://jovebaben.epizy.com/excel_vba_get_last_used_column_letter.pdfIn PDF document text
    • http://jixojamut.epizy.com/monthly_calendar_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43baa141-5840-4a69-ac2f-7a29400a7704/mesa_boogie_maverick_dual_rectifier_tube_guitar_combo_amp.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/vofubazupelejileta.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/17643541721.pdfIn PDF document text
    • http://xufizup.rf.gd/tuduwediwotijeruroxiz.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/marriage_biodata_format_in_tamil_language_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ea36f2-7938-4959-b69d-5234317f796f/petsafe_citronella_bark_collar_not_spraying.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_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 5696 bytes
SHA-256: 317a1aee33bfd3c39c09dac0331826dbc5296e9eb12f2765bbb581c209b124f4
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 10188 bytes
SHA-256: 7e4a911af6adc3e4c2a753ef126bab705d2eda30c28ca8d0bd43f0116ad150df

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