Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19c18b3ecfd3ae5…

MALICIOUS

PDF

72.9 KB Created: 2021-04-04 12:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360f73ad203ad674af455ba7c5fbfef6 SHA-1: d790c7c915011e9c0a2ea5536d6d84c06e5390cb SHA-256: a19c18b3ecfd3ae537d02cffde0157a72547af439bf3a222b5a14855eace5a72
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=knight+and+kingsway+vancouver
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/5556743.pdf
    • https://vojufeluwa.weebly.com/uploads/1/3/2/6/132681665/064480d.pdf
    • https://cdn.sqhk.co/lasijutag/bUfU1hj/sims_4_superhero_mods_2019_clothes.pdf
    • https://cdn.sqhk.co/tolononof/xhaWjbG/raperafaje.pdf
    • https://cdn.sqhk.co/jemajujo/ahc6ibY/missing_money_nj_phone_number.pdf
    • https://cdn-cms.f-static.net/uploads/4388177/normal_60369c33596c0.pdf
    • https://nunogekir.weebly.com/uploads/1/3/4/5/134597520/58ab1470329.pdf
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/gajulizivin-zofinasizagu-wuvofuzu-gadopotukin.pdf
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/rimokexaneruteb.pdf
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/jorojonalesutoz.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/cea00bf.pdf
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fe41cf0d7b50.pdf
    • https://xizenarinirogav.weebly.com/uploads/1/3/1/4/131437147/0822c4bf27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timeziso/amazon_kindle_mod_apk_revdl.pdf
    • https://s3.amazonaws.com/remavuj/jaxatemujojefonofuzegadap.pdf
    • https://s3.amazonaws.com/boduxatavepe/88334968569.pdf
    • https://s3.amazonaws.com/wumodukubaru/pdf_file_from_web_link.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_off0000de39.bin
5990945c7cea29d23652e12b94ecba57f05cbc6226a36ad32135d98dc6071c92
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 5456 bytes
font_01_sfnt_off0000f0e0.bin
9cdb98969ed4f77885659b6cc74d96a24a5831f9a91c147db10ef4c03a9d31fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 11004 bytes