Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f598e4e12dd8d6e…

MALICIOUS

PDF

128.2 KB Created: 2021-01-14 15:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ed1bd59d6523e5363ba67c128a94d057 SHA-1: ef915402586558f0cbcb968abaaabc807d51e97e SHA-256: 1f598e4e12dd8d6eacbaf902a6db41bca796a72a33c354700683b300ec91a2c1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous links on disposable hosting suggests a link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/123?utm_term=pokemon+xy+evolutions+release+date In PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/lemujonud.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/DMcFMgc/bovulalenibuneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f8aa4c7abf8a.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/1071535.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/denoxakomuf-nagopis.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/UjcWtgh/kafanajiki.pdfIn PDF document text
    • https://nudesobaxoxis.weebly.com/uploads/1/3/4/6/134666739/damozagidav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe83d7615783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5fe33abb1f0cf.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/kosipefojaw/breckenridge_snow_report_december.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/sitejobibekofununedobiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001abc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABC6 3612 bytes
SHA-256: 8ba6d1d738599648548002aeea04fba837f3b2bd527f3f0d9b426c04a2377ec4
font_01_sfnt_off0001b87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B87F 5268 bytes
SHA-256: a3f5d3cda896894ad5e30fdcf37083bbaa1b834b400b805967be39f40a69b5c0
font_02_sfnt_off0001ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA61 11552 bytes
SHA-256: b558dbbdd47c92d15269e2db9d395348cf70fd339e3dcf4b59169c91b22bd484

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