Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4e3f6347c4d3c4…

MALICIOUS

PDF

93.8 KB Created: 2021-05-22 16:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e15be8abe3528a981b795101a94a9980 SHA-1: 20d791aff9c39f3592a86bbca2ed2aba2ae5a8fc SHA-256: fd4e3f6347c4d3c4fa989d5b4aaedbec8f646c173e309cc866aede2eda20d25c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=ingo+swann+art+for+sale PDF link annotation
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/rupew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fe240f6728cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_601b866e40d5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5ff4b4594239f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_605f0ce3931aa.pdfIn PDF document text
    • https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/fefitokovume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_605139e0672c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_600dd2a484883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487906/normal_5fff1c2659004.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/9fb378a0451f3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_606e101a3fb68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_600b8d39e67b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_60476811607c4.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/ruvawen.pdfIn PDF document text
    • https://fuwiwidiwijidex.weebly.com/uploads/1/3/1/6/131637339/wapazu-mozivev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_60431f3676f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_600e21412f98f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_605f2d92edac3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/52649835870.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/developer_options_android_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3b82f0-7173-4ba4-a710-29c60e556bde/wijega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bbd59f-7f15-4e74-bb57-5ed96a5040f7/what_is_osha_29_cfr_1926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0349fbb3-40ee-482c-8872-0399bd09959c/88508498270.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/13189475611.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_off00013285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 4964 bytes
SHA-256: 598f53e3c151da06a64cf477088e66b0b82ada45d19bef622b2ea36a1e8f6f40
font_01_sfnt_off00014392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14392 11224 bytes
SHA-256: f37d49402ac45ffc0c07093dfd3fe5a8e14f679dab1188db48bb0ff23b55ed6a