Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c34040402b5c61…

MALICIOUS

PDF

76.5 KB Created: 2021-04-06 09:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 81e0608752096de42910b0e068957b08 SHA-1: 59fae778c5c2239ae06f33298407f74407f964e0 SHA-256: 11c34040402b5c61b578fd5583261e383c62b5db35a73bd212b86955b9bb557e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://druttle.ru/wix?keyword=osrs+ironman+guide+2020 PDF link annotation
    • https://xuzitimezavut.weebly.com/uploads/1/3/1/8/131856372/b15bc85b4f1a.pdfIn PDF document text
    • https://janepowowufevi.weebly.com/uploads/1/3/4/5/134506071/nukigitapuwun.pdfIn PDF document text
    • http://begetus11ppz.xyz/katoen_natie_annual_reportcm631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_6022245324709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_6035bfb64a26f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_604d7350c20d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_6052e8dcbb136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_6052b7de4359c.pdfIn PDF document text
    • http://nekretnine.site/silent_auction_website_templateppo2b.pdfIn PDF document text
    • http://gonzo-3d.com/78316432985rsj8r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_602197b24bc74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_604337ba9ab47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fe9114b57ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_6049d23f174e6.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/resilu.pdfIn PDF document text
    • http://baffer-shop.space/baduxa1wbzj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_687f5a8a4a54484e8300dcb1f5dcc229.pdf?index=trueIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_2e880626610f44c9951f58b15101b2ed.pdf?index=trueIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_f7565cb6d42b4586aa123c2ee2da36c5.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_e2d27277ec064c2ab2222bd882734d13.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_ebdbd9d06d5f42e0b3f9542aea23f02f.pdf?index=trueIn 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_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 5416 bytes
SHA-256: f4c8a7781464df344f0d446a52ed6be8c0996bb564604e8698d89f0dada6471e
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10976 bytes
SHA-256: bfe4c6fb85ba7edad2caa4d05c5f517ac52cfb2a04c8317e7b747090db2d3674