Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8b1efb7073940c…

MALICIOUS

PDF

73.4 KB Created: 2021-02-26 01:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 032960af4f5f43da9add0a47ed715a1d SHA-1: 045b731bd206d2950723beea80fbd4088af45b8e SHA-256: 4a8b1efb7073940cfb81a08e0f25c403199a938deacefdf91bd6a4c161ece99f
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, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although the document body is heavily obfuscated, the presence of a malicious URL suggests the primary goal is to redirect the user to a harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=what+is+a+shaded+cream+dachshund In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_602d0e89c9d00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fff4d944d9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_601b7ce245e62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425916/normal_5fcb2f85a07ca.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/wizomoravazub/bimanual_examination_uterine_size.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/78232016677.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/pewexufefukenojode.pdfIn PDF document text
    • http://volapubexu.epizy.com/lelunopixokop.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/68864562687.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/pathfinder_witch_hex_guide.pdfIn PDF document text
    • http://lusiromipu.epizy.com/google_chrome_for_android_2._1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/dojer.pdfIn PDF document text
    • http://mafukifuwu.epizy.com/ragnarok_guillotine_cross_equipment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/dijododemebe.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/nosidubotudolekaga.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/identification_card_application_form_california.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/49801946619.pdfIn PDF document text
    • http://jujilopuvij.rf.gd/bcd_to_binary_conversion_in_8085.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/black_tie_formal_high_point.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/html_email_format_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/kill_team_starter_set.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/attendance_register_template.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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 5160 bytes
SHA-256: c163ddee2e367b738d1adc3c122327750eccb5ab61e59ef183c37513f0a9f0cd
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 10868 bytes
SHA-256: 662b3d7716e95d960d5b948df2d43d1c68d9a37b5dc55920db16e73b7bf368b7

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