Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b941b0f5c55caf1…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 05:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e73960f6110bf6b3b033e05b85563a0 SHA-1: 949a22977ad5e25e2825e3ebf95882f518686546 SHA-256: 5b941b0f5c55caf19601e4791ba7c4571cdb983d56bf8ef09ea907be4ef3f815
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF is part of a larger scheme to generate traffic or distribute content via numerous linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=blackwell+companion+to+aesthetics+pdf
    • https://cdn-cms.f-static.net/uploads/4472773/normal_5fe863af34ae8.pdf
    • https://cdn.sqhk.co/guledijuxi/hcjbVAR/restaurants_near_stakey_s_pumpkin_farm.pdf
    • https://cdn-cms.f-static.net/uploads/4447626/normal_602f37a3a1242.pdf
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6020c614b9be7.pdf
    • http://kyukty68.xyz/poulan_pro_snowblower_parts_diagramd7qkt.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_6047e94fd6b5e.pdf
    • http://lnstagram-blue-badge-form.com/fepafiropowuvimpueen.pdf
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/6c567c.pdf
    • http://larokamexi.sportsontheweb.net/sufabefafuves.pdf
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/potakixaxiwixa-lojibuw-dasafi-sofapiwus.pdf
    • http://gebomomeza.22web.org/99080320930.pdf
    • https://zosifoke.weebly.com/uploads/1/3/0/8/130813504/namegadigejo.pdf
    • http://gukiduwonaxinef.getenjoyment.net/dell_inspiron_n5010_network_drivers_for_windows_7_32_bit_download.pdf
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/6758714.pdf
    • https://cdn.sqhk.co/lojavowi/fLyrajd/47970892251.pdf
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fcea744d9002.pdf
    • https://cdn.sqhk.co/jezumasulej/cLiePa6/pegifitomapakiz.pdf
    • http://gifipagi.22web.org/women_s_clothing_design_templates.pdf
    • http://woodlesenka.ru/jawizinibihabgo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f103.bin
1ee0e3a343dea91e34708fe6e9c7bb5b8a31cc954609bc3e52e8e9d113d1193e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 5504 bytes
font_01_sfnt_off000103b1.bin
f476d756f35a9268d90aa8f08ca88d1b0d73f06188f64a730bde07ad4f7fe8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 11588 bytes

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