Malicious PDF — malware analysis report

Static analysis result for SHA-256 374700863f6210fb…

MALICIOUS

PDF

67.3 KB Created: 2020-11-20 23:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c6077a33850939762abaa0da742aef9 SHA-1: b45c16d5c5a522695d9cbdeb10b49194ec53f66a SHA-256: 374700863f6210fbd6be02e8aa09c7cfe741a2d941cbb6f424828d6aceaf27a5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or phishing campaigns to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to facilitate the download or redirection to malicious content, likely through embedded JavaScript or by exploiting PDF vulnerabilities.

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 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.
  • 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://trafffe.ru/123?utm_term=heart+dissection+worksheet+middle+school PDF link annotation
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/konabewil-fesagu.pdfIn PDF document text
    • https://zewogamiwivu.weebly.com/uploads/1/3/4/3/134313422/1585528.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/zozenopadofedotuzo.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/zusarel.pdfIn PDF document text
    • https://kalokiran.weebly.com/uploads/1/3/4/6/134632324/c498263119c.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/romikasezew.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/6233643.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/sajowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458615/normal_5fb7c624102e0.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/wefemabeni/35174792016.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/livro_budismo_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/xogaxubud.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/emulator_android_games_on_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/2001_f150_headlights_stay_on.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/37459247626.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_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 5296 bytes
SHA-256: b52af03c097fe811038204d7c03a33d3b0fca9287228458ba4b596548eed4111
font_01_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 10364 bytes
SHA-256: 6890e6879934eefe812f9f6432941826424e981c9e58b83bdd401ba29f0b7ce7

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