Malicious PDF — malware analysis report

Static analysis result for SHA-256 e556cbff0fdf7c77…

MALICIOUS

PDF

90.5 KB Created: 2021-03-19 02:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4593b82c57bb1066cefd00b42162b3c3 SHA-1: 1278b151799f9d60ecdec93ffb906120e54a57b9 SHA-256: e556cbff0fdf7c77c19eee66992d847076e59b9947ff8931ce7645fcf1a34151
126 Risk Score

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 0.9993

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 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://mezovuduw.ru/wix?keyword=producer+consumer+decomposer+worksheets+grade+5 PDF link annotation
    • http://fejiximodanu.mygamesonline.org/ligijew.pdfIn PDF document text
    • http://madamzero.com/se_ha_perdido_el_pueblo_mexica_analisisr65dq.pdfIn PDF document text
    • http://logunej.iblogger.org/construction_of_dc_generator.pdfIn PDF document text
    • http://itmax.info/bovaneoy1cr.pdfIn PDF document text
    • http://sewiximafa.22web.org/setofojal.pdfIn PDF document text
    • http://choosenews.space/crown_of_midnight_book_trailer1qsn6.pdfIn PDF document text
    • http://ompala.store/91880243805el9k2.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/chairman_s_report_body_corporate9ipd9.pdfIn PDF document text
    • http://opticsystem.website/92608538679tb2dp.pdfIn PDF document text
    • http://peuly.xyz/38293958961kwa5a.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/aviation_weather_services.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/hitachi_miter_saw_c12rsh2_reviewz8dee.pdfIn PDF document text
    • http://sbrf.link/what_is_sports_management_in_collegeozjv8.pdfIn PDF document text
    • http://bandalet.club/48104896322lpms6.pdfIn PDF document text
    • http://twoup-viktoria.online/pasiveq7m69.pdfIn PDF document text
    • http://fasad-dom.site/anker_bluetooth_keyboard_wont_connectf5agp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guridej.epizy.com/quantitative_research_data_analysis.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/tactics_for_listening_third_edition_tapescript.pdfIn PDF document text
    • http://beperedusewigu.epizy.com/jelipazuz.pdfIn PDF document text
    • http://fururebinupi.epizy.com/92514933874.pdfIn PDF document text
    • http://govujetimavex.epizy.com/56270636111.pdfIn PDF document text
    • http://tijekozevapika.epizy.com/sears_kenmore_sewing_machine_manual_model_5186.pdfIn PDF document text
    • http://mowelafawugek.epizy.com/gana_cut_songs_masstamilan.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_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 5736 bytes
SHA-256: 5b1b2df7fffb36075b446c192df073e5ecc3ade789e0248349be0659b414b66e
font_01_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 13356 bytes
SHA-256: 180cc2543746ef121ad9c3e5e1320156829da428f49d31e27be9502d98ccf89e

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