Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b22ffaa9e3bc98…

MALICIOUS

PDF

85.8 KB Created: 2021-04-04 13:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6a3125cef0482dd7a65ca3918d8ae4f6 SHA-1: d35f0fb0dcb8d7b6722f31447cb28d610e6d10cc SHA-256: 36b22ffaa9e3bc98fe3c5ca69bfc3d1983446b1b138e95311a863e4bd45fcdbc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing lures. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/strik?utm_term=the+city+and+the+pillar+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475727/normal_604476de20c0a.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/8740091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424007/normal_6000b42325656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_6012c5e403825.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/ieU8ies/71000258045.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/qk4iegh/home_design_miss_robins_home_makeover_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/bFtBgeV/gelefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fdc339e08781.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/susitedemid.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/65266380443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_603fdc53038aa.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/3iXhgW5/sigasadapiropikezov.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/xazelulag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fdf38d07e46b.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/fuwudof.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/885918.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/779ba5b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_605db1073d453.pdfIn PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/cc27bc169.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/0hipdTh/tobajizutebajedulofite.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/wibuwufenisevexapija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_6059f0b0c0dfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujebij.onlinewebshop.net/myself_essay_for_interview.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 5116 bytes
SHA-256: f89de68937dad60bd61e261cf0fd5b6e655461936ffa47d5a0772b85caae2c8a
font_01_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 11096 bytes
SHA-256: e5f139b442c60e09d52bc04c3437e4566fc0a8ee2a4fc1457c7753b15f780e0c