Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd41b86e96b8b016…

MALICIOUS

PDF

91.5 KB Created: 2021-02-06 21:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f89e8d41ff9c0c90cd4e86267c12f78b SHA-1: 90592545ebf778d20ad84bfc37404654ee1755d4 SHA-256: fd41b86e96b8b01669bc5c31f41de2dce9c14897adbdb62554b85327a86aa694
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malicious redirection campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=us+forest+service+international+programs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fe2dba8cdea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_60199caecf4a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_601b34f1ce6a9.pdfIn PDF document text
    • https://wowevabesal.weebly.com/uploads/1/3/5/3/135322278/9267efbe1187d19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421940/normal_5fcff6d303b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5fd990f8b2012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_60168b3873032.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/notuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ffcae66ae723.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/sowigixupiraku_sakatajikoxapi.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/gotuxugupekoj.pdfIn PDF document text
    • https://divupamafotot.weebly.com/uploads/1/3/0/7/130739309/0fe601f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490138/normal_60021f2440678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fc775555cb02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_601eaade15fed.pdfIn PDF document text
    • https://tiselewo.weebly.com/uploads/1/3/1/6/131606631/xujupixuxi-teparivil-duduzumana.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/viwoxuz/97297591405.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/malowidisezimozujosip.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/store_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/formal_email_closing_thank_you.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_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 5388 bytes
SHA-256: b1efc3dc919c9b7d5fdc1961378ee4a1b33d54c24ade658ce281d560f61d50c8
font_01_sfnt_off00013a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A23 11228 bytes
SHA-256: 8711afbbda07741d113ab2f7b38895c9e7887a1fb32b870d97fd89a43248e410

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