Malicious PDF — malware analysis report

Static analysis result for SHA-256 612cdb0742293412…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 23:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8cec0fb80496d4f26c1091d422466c42 SHA-1: b59c321dac07a03584878628426b84a53172c844 SHA-256: 612cdb0742293412c0b69466ceafca491d4c0f1b97bae67e7f97b4390964c491
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, contains references to "Windows 98 serial keys" and the presence of numerous external URIs suggests a link farm designed to redirect users to malicious content. The SE_CLICKFIX heuristic indicates the document likely instructs users to manually execute commands, a common tactic to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://midufefew.ru/wix?keyword=windows+98+serial+keys PDF link annotation
    • http://healthit.space/senoxub6o5w.pdfIn PDF document text
    • http://wisemad.22web.org/quicksilver_throttle_control.pdfIn PDF document text
    • http://eduha.online/62043006510cgnre.pdfIn PDF document text
    • http://lidisafudototi.iblogger.org/15219555086.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/ZlshcIB/rusuxusulopibiko.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/6f1b90ce-97be-40d1-8497-6341c83eafda/dividing_fractions_by_whole_numbers_worksheet_year_6.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/passing_data_using_bundle_in_android.pdfIn PDF document text
    • http://xemixelumulimos.epizy.com/42844524254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f380c5d8-e437-4b36-b370-a3c78cfa0b53/bangla_to_english_translator_software_for_pc.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_553ff7830a6c4e568e484d22d190f054.pdf?index=trueIn PDF document text
    • http://jedejuleler.epizy.com/capecitabine_mechanism_of_action.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_9054ba3971744956a0fa31ecd7a23848.pdf?index=trueIn PDF document text
    • http://fekepoloper.rf.gd/update_bios_in_msi_h81m-p33.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2519287a-5bbe-4bef-9398-10637aa9a40e/gagevafelibuxidebir.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_d2b3988284d94924a61fc6947bffaeab.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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 5440 bytes
SHA-256: add8d2de43327068a80920455ed3a5dd75f54effab87af3091a7d4b9de683fff
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 10776 bytes
SHA-256: 8cac45fce91e17a61f14976669a964149c7d6129b20e4b4fd5d44d120ec62741

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