Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e82e418ec42fe78…

MALICIOUS

PDF

76.5 KB Created: 2021-03-10 08:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1b7b691e61c44b0229d31200b57ad295 SHA-1: b47c9b9c6b5d23632f8f48b35e4f2dc89dfe5ca4 SHA-256: 7e82e418ec42fe78eb619daf526e4cf5a1e039ae82d17ee2921a68d4afd10aad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://crophysi.ru/aws?utm_term=sex+education+in+public+schools+articles PDF link annotation
    • http://sis-paypal.com/14255696572xk1ki.pdfIn PDF document text
    • http://productwood.ru/wafoguvhipdk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5ffbe12887a64.pdfIn PDF document text
    • http://ashotik.space/suvameridumef1a16e.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/5474060.pdfIn PDF document text
    • http://voztrans.ru/3rd_grade_history_worksheets_free313nn.pdfIn PDF document text
    • http://saleproducts.pro/college_algebra_with_modeling_and_visualization_5th_editiong6iwt.pdfIn PDF document text
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/dokabir_tugadadita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fcb2b59dc379.pdfIn PDF document text
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/6358936.pdfIn PDF document text
    • http://interbankdigital.com/python1iw12.pdfIn PDF document text
    • https://zugatuwedi.weebly.com/uploads/1/3/0/8/130874050/541fb1d3b1a5.pdfIn PDF document text
    • http://www19216801.site/berserk_volume_38_cbrwbau4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd10a00b3ea3.pdfIn PDF document text
    • https://jitezawedum.weebly.com/uploads/1/3/4/6/134688152/tozogavonaf-rowik.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/68596c82-f0cb-432d-8a57-fc8b9612051b/27723209260.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_cc167fd2f0b045d0bbca728362032b95.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_7e41d4d4ce324b9e8d86ebdd2efe6f62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a777818-0b65-4242-8c5e-3a4d7466bc9e/8812111992.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_58f5dd6852c9429e8066d06b026c8544.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5472 bytes
SHA-256: 5f866707703db8893d5b76b8d77c3e22833f2973426ff8351c47b4764245064f
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 12188 bytes
SHA-256: 399921a21513f3e26ad9605a87e0cea4e7c32327a4927cb76600d863667b8154

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