Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1715a1a2ecb65ae…

MALICIOUS

PDF

74.9 KB Created: 2021-05-31 21:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81eb883116e8c7fe1ad9c180e9cc594e SHA-1: 9157defa9224ab614f41b4766b9a306a61c1be1a SHA-256: c1715a1a2ecb65aedf7791dc096d32bde96d9778c1b2dc24275a25ef56bca561
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external links, many pointing to disposable hosting services, suggesting an attempt to distribute or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to external resources, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://wastran.ru/pbw?utm_term=top+5+fb+auto+liker+apk+download
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/a412b53ee9116.pdf
    • https://rimudidux.weebly.com/uploads/1/3/4/5/134597050/01c3eec.pdf
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5fd987f9a8aa0.pdf
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/92ea8ae9a8.pdf
    • https://magenudelekoj.weebly.com/uploads/1/3/5/9/135975171/4f41efe051.pdf
    • https://cdn-cms.f-static.net/uploads/4366321/normal_604630f4a7e71.pdf
    • https://static.s123-cdn-static.com/uploads/4371269/normal_5ffca9659291b.pdf
    • https://rupuleda.weebly.com/uploads/1/3/6/0/136002844/piruwupuku.pdf
    • https://cdn-cms.f-static.net/uploads/4417140/normal_605fe6751bc9d.pdf
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/2782288.pdf
    • https://rewegabelera.weebly.com/uploads/1/3/5/3/135390500/8610817.pdf
    • https://zapojejomelaxi.weebly.com/uploads/1/3/0/7/130775516/semonofutoxa.pdf
    • https://talokawibameze.weebly.com/uploads/1/3/4/0/134000376/677795.pdf
    • https://tazateniko.weebly.com/uploads/1/3/4/8/134885152/910b9848f6f853.pdf
    • https://cdn-cms.f-static.net/uploads/4445128/normal_6046dabd84ee8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bcbaa25d-28e7-46f3-bd1a-9e6d90c2c19b/does_rainbow_six_siege_have_a_single_player_mode.pdf
    • http://mefijunov.pbworks.com/f/beethoven_spring_sonata_violin_sheet_music.pdf
    • http://nunaruribeg.pbworks.com/f/the_perks_of_being_a_wallflower_movie_free.pdf
    • https://uploads.strikinglycdn.com/files/ec518ede-55dd-4cc0-bc2a-87f65057e630/wefufumatibuzi.pdf
    • http://mumubib.pbworks.com/w/file/fetch/144413340/ejercicios_resueltos_de_gases_ideales_fisicoquimica.pdf
    • http://wuxikadafi.pbworks.com/f/88183737495.pdf
    • http://volikedejefa.pbworks.com/w/file/fetch/144420915/13267700894.pdf
    • http://nusuwoxub.pbworks.com/f/50493482842.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144413424/13442655968.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74b.bin
e3b33f7424080572b4bc1d4d0cccdb9a8085450642110bf83fb9e6d651b4f5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 5228 bytes
font_01_sfnt_off0000f938.bin
0f46f80e961d06f4cd402d23933798d0f35141dc74c4bf4ddf96c11b6d433c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10752 bytes

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