Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0ba9bb0ccef509…

MALICIOUS

PDF

70.5 KB Created: 2021-03-04 05:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 417100b5dcf7a7b1721bdba7599f1bcd SHA-1: dbdc76813df4ce7f02b6a0077e6d23709459342e SHA-256: ef0ba9bb0ccef509232a5d156dbff7f4ed2adf680ed3c2a3b749c6c24e027f91
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/cd23a6b53c5a.pdf.
  • 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://crophysi.ru/strik?utm_term=what+is+a+sentence+openers PDF link annotation
    • https://cdn.sqhk.co/banozesimane/Jqjdjfb/32829588750.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/b0gX7jc/roller_ball_lip_gloss_80s.pdfIn PDF document text
    • http://zewidixoxub.iblogger.org/venuvikekerit.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/cd23a6b53c5a.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/f2k0Khh/63754022570.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/e4M8kii/tiktok_app_download_2020.pdfIn PDF document text
    • http://zujixowuxitokad.22web.org/model_airplane_magazine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelewonaxiguso.epizy.com/29057654339.pdfIn PDF document text
    • http://jilagikudi.rf.gd/backstay_adjuster_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/phases_of_matter_review_worksheet_answers.pdfIn PDF document text
    • http://kinowazekuponaw.rf.gd/transformers_robots_in_disguise.pdfIn PDF document text
    • http://nonavijewiw.epizy.com/39507263034.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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 5004 bytes
SHA-256: 1686bbf1e626586fcbc6387807a5d081ea8382962703b58aecbb7c02e26a7825
font_01_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 10136 bytes
SHA-256: adb9e61e0df9c3ea512d242314036b47b0fde8c27e854339a78346cf555d2038

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