Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f8bc5b8611be5c…

MALICIOUS

PDF

67.5 KB Created: 2021-01-12 16:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dcbb5ea4ff526c53807ee19341472b79 SHA-1: d88a9ba37a590c11cb47275eb81daee2de7372b3 SHA-256: 17f8bc5b8611be5c66b2182315ea39e55d0e517e77b3aa1935bd6bb20b2e6022
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'free stuff', suggesting a lure. The presence of numerous links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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://traffmen.ru/wb?keyword=free%20stuff%20october%202020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4402000/normal_5fcdc4b55770c.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/uifOjcg/giripemimiwosuzip.pdfIn PDF document text
    • https://juwememuju.weebly.com/uploads/1/3/4/5/134523402/ba23ee1c4382de.pdfIn PDF document text
    • https://site-1172223.mozfiles.com/files/1172223/nasa_news_mars_life.pdfIn PDF document text
    • https://site-1178280.mozfiles.com/files/1178280/27508585077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fe8b5e2bc140.pdfIn PDF document text
    • https://site-1176323.mozfiles.com/files/1176323/easy_repost_for_instagram.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/rutufokedizon/fashion_cost_sheet_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/peshitta_aramaic_english_interlinear_new_testament.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/blackberry_bold_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/kebigavasogaxige.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/st_charles_east_bend.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_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 5000 bytes
SHA-256: cffc78bc14174827bf428e6cd2c4561669138c5ed72020b11272bbcbf42ac58d
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10864 bytes
SHA-256: eaa655622e8f188000b9dfbf03244475a77b255a312fe64d7b2e87b344fc823e

Open this report in the interactive analyzer, or submit your own file for analysis.