Malicious PDF — malware analysis report

Static analysis result for SHA-256 592ff15f80e6faf4…

MALICIOUS

PDF

72.4 KB Created: 2021-03-22 17:37:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 47b8e15efd8131c4112720ba4b6c8cf8 SHA-1: 0d2948faff6b474433a514de966e219cf3237031 SHA-256: 592ff15f80e6faf48752ce0f57a542edd1bfe8de8122d314cbd5b732d08e499f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to 'covalent bond naming worksheet answers' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=covalent+bond+naming+worksheet+answers PDF link annotation
    • http://kojazunupetip.mygamesonline.org/94949226117.pdfIn PDF document text
    • http://ryduslim.website/25643458495jqzi3.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/17502054439.pdfIn PDF document text
    • http://mx50off.pro/favozodakirapenabovizogiuz6.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/ytd_video_er_for_macbook_pro.pdfIn PDF document text
    • http://themarkuzmusic.com/zogisajeralikujh4obp.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/kalusukovalani_ringtones_naa_songs.pdfIn PDF document text
    • http://xajoraxi.22web.org/sql_server_database_engine_2017.pdfIn PDF document text
    • http://pro-komp-master.website/what_do_we_do_when_we_feel_nothingvqs16.pdfIn PDF document text
    • http://wetikufuwigiwox.iblogger.org/rafimozadedekafoxo.pdfIn PDF document text
    • http://prizinsta.online/lugiwikevuledomax03c0y.pdfIn PDF document text
    • http://rmk4sale.xyz/washington_post_crosswordrx4r3.pdfIn PDF document text
    • http://damita.fun/32075537845qzpkq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zurekenalemone.rf.gd/comparative_financial_analysis_report_of_a_company.pdfIn PDF document text
    • http://jupegojut.atwebpages.com/fusifada.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_48a496d926be4ca6aa4fc38855b94909.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_37f143784a8642a89740b5d0aba1ffce.pdf?index=trueIn PDF document text
    • http://nufurezoguboli.epizy.com/14942639767.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_aa1cd66e60344b6c816090d7e03181e1.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_685b593a0079476dbf7a3c9ab65195fd.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_242285cff1f843289fc22a9a9e99602a.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_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 5500 bytes
SHA-256: e7d22a19b73263480acaf5aec501d67b99503b9e5e0f7dff0523a612cf28549b
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10224 bytes
SHA-256: 86a2b24a22a6ba7b3581923ee3141630947ebee019c5e2b661dca89006b0b6ef

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