Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67904086d41db32…

MALICIOUS

PDF

73.5 KB Created: 2021-02-23 03:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b86898b7253dba7ded29726b266b1d77 SHA-1: 0e1216f02a232332102e29c20629479698e6f62d SHA-256: a67904086d41db32a7393e55a71dae0120bebe35ebb23e7613b3e85c1b2508ef
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The embedded URL is used to redirect the user to a potentially malicious site, likely for credential harvesting or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=polk+audio+subwoofer+psw505+review In PDF document text
    • https://cdn.sqhk.co/dikozogub/jjgVih3/51029529479.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/Bhd1hdw/dubai_covid_cases.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/yjghgia/jurijakeladifal.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/iiehggc/mumebasagimafolu.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/iidmjco/euro_train_simulator_2_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/hiigchi/55228146847.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/wukara/81723170533.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/ywrobot_breadboard_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/android_emulator_has_no_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/girulokukaxid.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/zojaxojesetemozusugojopuw.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/android_binder_aidl.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/vaketorekafafisov.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/follow_up_email_to_prospective_client_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/27807949590.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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 5656 bytes
SHA-256: 95d68e2aa32f8d920eae89280152190b7c7571e03022033f3ab62da3ee88917a
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 12052 bytes
SHA-256: 589404e1d99a0a97722fd16ce6090c669cc0e18b90c3418fb3a04e77d88c4ffc

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