Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19e5b1258bdc788…

MALICIOUS

PDF

66.7 KB Created: 2020-11-23 12:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 83feea23ce6e7076ad81747ec79a89f2 SHA-1: 9ee201f100719dcc5ee4ac6d79819481a9024b9c SHA-256: c19e5b1258bdc78879488beec12a31af59b5a3c444ddf8f038594fd3f29af964
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a large number of external links, many hosted on disposable domains, indicates a link farm or phishing attempt designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=maria+west+side+story+vocal+sheet+music In PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/7185833.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/954475.pdfIn PDF document text
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/6920981.pdfIn PDF document text
    • https://vexuneka.weebly.com/uploads/1/3/4/5/134584550/jevipa.pdfIn PDF document text
    • https://geligike.weebly.com/uploads/1/3/4/5/134590657/tubovudig.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/migimerafofob-vexamawi.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/jokonojesezudemim.pdfIn PDF document text
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/88da28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2100240-965f-471e-b63b-f383a2d65b43/86669506522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb873b11-896c-4bd7-a40f-34ec1d227e30/vidulirugasuzonu.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/aqa_gcse_physics_equation_sheet_foundation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15027691-2746-467d-b602-f2f2766b5f91/35744201104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b879719-a4f7-4682-983a-d84153478bdf/aspire_login_ads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c0045d-4a1d-4363-addf-a2013570398a/46677555658.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/57047227675.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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 5436 bytes
SHA-256: a5813379ba8aabfa9a47629a8ea2ce29a72264f452025ed4c59d7fcea65eaa2f
font_01_sfnt_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 10380 bytes
SHA-256: c985f00a62681b3365bd9af55ffab24c6ee0332d4de638ceda06bc4b49449d49

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