Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a3bb00e98d39dc…

MALICIOUS

PDF

79.4 KB Created: 2021-03-06 06:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b735fdaa41f1f4f13d3bf98b5d77e691 SHA-1: ea2db5b071099f454aeebc3159a3cb31c4eec1fa SHA-256: f8a3bb00e98d39dcaf0b1f9ca0475393ca4eaac1ec24e7e52716bc4cd75780b0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=how+much+does+brother+pe-design+11+cost PDF link annotation
    • https://cdn.sqhk.co/kubepugemaki/ggX4hi1/rutalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_601ae6f2d67e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_60055b3398f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_602a3365413c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_60291d4c58c64.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/erGhUr1/84874916643.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fce18af3c759.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/dAB2gj4/51608231030.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/dhdZjez/50464135405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5fc6742655e3d.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/yiixijR/lazilojuneloputevugoxuxif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c5f8d8d9-8505-4c3b-a1b9-9b94039d2bee.filesusr.com/ugd/cacfd7_09a7044999fe48d3a548eaf792bfd322.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_e547f042c1454cdab7090fa05b5bc9b0.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_3ec682343a124b5e8b5a27e11218b666.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_b0a1883b0e49474ea2b07e50a9578d21.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_8866cb940c2a4ebf8e0aa67369985d7c.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_ff37eeb7fde34fa080574cd44135e85b.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_eb31544a324f4c489251023df1061f6a.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_dc50225728424410bba75345cba278ed.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_9d4cd4b7b6514a999759c8d2509b1244.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_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 5524 bytes
SHA-256: 1b02c5aa3b415abd7627cf3353028f6dc5f2fc69321d0fd50238d8e8952c1e4e
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 11812 bytes
SHA-256: 6737f15b4e584be8c5c0a54fb5d74e9de07b71743a468de90aaf9910b26a4ecc

Open this report in the interactive analyzer, or submit your own file for analysis.