Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea441eb9f944a5c8…

MALICIOUS

PDF

74.1 KB Created: 2021-01-15 06:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1882dc433e2b7fb29f74b9a8c4640415 SHA-1: e86a8e448cda2123f718e9ace72a180aff5dc06f SHA-256: ea441eb9f944a5c86839babb9456bde8009a63f9ba8a970714e7c16dc0aa4986
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely as a social engineering lure to install malicious browser extensions or updates. The embedded URLs and the nature of the link farm suggest an attempt to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafftec.ru/aws?utm_term=best+template+video+editor PDF link annotation
    • https://zigifivabukom.weebly.com/uploads/1/3/4/4/134460242/gimamuraropafive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453332/normal_5feb40e88e3a0.pdfIn PDF document text
    • https://sorurilinoko.weebly.com/uploads/1/3/5/3/135397097/eaa39b2d.pdfIn PDF document text
    • https://jesiwiluvilad.weebly.com/uploads/1/3/1/8/131857580/3684000.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/Diiwyic/get_rid_of_annoying_ads_on_websites.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/ae7e4.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/nazuwirapebujotewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fe62a9311144.pdfIn PDF document text
    • https://sukuvigu.weebly.com/uploads/1/3/4/2/134236057/parofugisuzaz-bebudabezamefa-getiwenisavujir.pdfIn PDF document text
    • https://biruwilajefi.weebly.com/uploads/1/3/4/6/134651793/xesuribaveped_dasekevutaso.pdfIn PDF document text
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/zanolak_xejob_tudokaku.pdfIn PDF document text
    • https://gosabejeda.weebly.com/uploads/1/3/1/4/131453015/xufigebema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zetare/84854509741.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 4896 bytes
SHA-256: 7c86cda9e3059d5e7bc6cbc03b0018226a917398cd636eec1bd3742a7098cdc5
font_01_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 11220 bytes
SHA-256: 4a7173372aa193acab5451937679a0dfcd99e8fb7cad412c7ede9ef47abe9197
font_02_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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