Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c982f3fbad8002…

MALICIOUS

PDF

73.4 KB Created: 2021-01-14 17:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4851dd93feb31c468f499ceabdffa632 SHA-1: ea1f5a3cf1a3a94a163b58f1f4aa3a0dad6ab979 SHA-256: 94c982f3fbad8002987407ae9ac110df56989e97595fbecbd95f54bfc5e252e3
184 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ggtraff.ru/123?utm_term=photos+for+class+group'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious redirector suggests an attempt to lure the user to a harmful site, likely for phishing or to download further malware. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its content beyond the metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=photos+for+class+group In PDF document text
    • https://zazusixalug.weebly.com/uploads/1/3/4/4/134491239/detibixiri.pdfIn PDF document text
    • https://site-1180408.mozfiles.com/files/1180408/hello_neighbor_xbox_one_act_1_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/dgejhbP/free_resume_templates_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_5fb41fae39d12.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/zomixubiweb_gepejawinuwiso.pdfIn PDF document text
    • https://puvebimu.weebly.com/uploads/1/3/4/3/134311544/vagezigelova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5f99262172d21.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/pivedekenosurup_binerij_lobuli.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/patotale/65491662716.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/steve_berry_books_newest_first.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/allaitement_maternel_oms.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/office_daily_expense_excel_sheet_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/second_conditional_type_2_worksheet.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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 5276 bytes
SHA-256: eaa483b5be74a67f2c385c8ed819962e8b6e2713fb9b1066cf61a33c0a57cb0e
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10468 bytes
SHA-256: 9b315e2e9f70b230a77cb6dca6ad0e926f36dba24267d2740098ccbddd569b97

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