Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb76ae2fda4b2e54…

MALICIOUS

PDF

78.9 KB Created: 2021-02-25 07:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6389af628a01ebefc6a851b31f931944 SHA-1: d248124e6866ef7dc49a8f962dcf50a6ad80d6f3 SHA-256: eb76ae2fda4b2e5421f4654aff36814517b2bfce27fa490ab43b5091964b95cf
146 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number for a fake issue. While no scripts were extracted, the presence of numerous external URLs, many hosted on disposable domains, points towards a phishing or scam campaign designed to redirect users to malicious sites or gather information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/123?utm_term=sears+battery+charger PDF link annotation
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/patugigikitirijela.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/570aa2f74e99.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/pewigizapuvo.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/2991530.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/iiima3A/97962086994.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/asighgz/dragon_stickman_transform_shooting_games.pdfIn PDF document text
    • http://worodariravo.22web.org/aluminium_sheet_cladding_nz.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/what_happened_in_shadow_and_bone.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/7ijayKm/photo_collage_app_free_download_for_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jurigixa.rf.gd/tipos_de_funciones_con_sus_graficas.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/7848175163.pdfIn PDF document text
    • http://jigiwema.epizy.com/android_sdk_on_mac.pdfIn PDF document text
    • http://bewexipobafuza.rf.gd/bulapipefofaxeru.pdfIn PDF document text
    • http://perepidowowavam.epizy.com/44876927528.pdfIn PDF document text
    • http://satuwegalenez.epizy.com/tylenol_overdose_treatment_guidelines.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_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 5376 bytes
SHA-256: 83bef70a4d9d23b2c964e9d59fb9ae4f5e08a3ad2689cb8487d281b67d869ed3
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 10380 bytes
SHA-256: 0eef0107124b5e47f1818353b28440dd754d1eab5f1b7e92d5b606ed1e55679a

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