Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d108b3281647401…

MALICIOUS

PDF

75.9 KB Created: 2021-03-06 13:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52dd49fc4bb40307b16d29a544692140 SHA-1: 508c4c84249294b50fb2af6fb8335f5770333171 SHA-256: 5d108b3281647401bb65e047264c4da499fc214d6ff600077816e1e7eb624268
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://leonvi.ru/wix?keyword=triangle+similarity+problems+worksheet', suggests a lure related to educational content to drive traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=triangle+similarity+problems+worksheet
    • https://cdn.sqhk.co/rosivapixove/xqojgij/76792322868.pdf
    • https://cdn.sqhk.co/dasofuduveje/c9WbieN/vuferezizuvajomivekalugir.pdf
    • https://cdn.sqhk.co/feketukadoz/hialhzn/wozizilefoxudubisojupak.pdf
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/kitapudexafuvoti.pdf
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/0d0959f88c342c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadupazageraf/63919000821.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_bcb46962029547b2a8952a338b0a04a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/577eb9eb-46b9-4dfb-867b-f9392a82e6cf/grammaire_progressive_du_franais_a1_a2.pdf
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_81fab856b4ac44fead18eb11b4549cee.pdf?index=true
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_9567a7a50a854b64a6d7c431ae035fb5.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_0e8afe2e7bc1402e86cab414ca46ae40.pdf?index=true
    • https://s3.amazonaws.com/fapaga/linikirosusapuwu.pdf
    • https://uploads.strikinglycdn.com/files/0d5f1bad-f63a-4c68-9daa-426b85a9d386/simaziburuwivojif.pdf
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_2595a439a0d140ecb32eb114ad81dfdd.pdf?index=true
    • https://s3.amazonaws.com/befafuni/ccure_9000_end_user_training.pdf
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_6caaa6767acf4ccb92477c7553e35849.pdf?index=true
    • https://uploads.strikinglycdn.com/files/faf243fd-c203-408b-96d2-9093c5af107a/arduino_nano_datasheet_pwm_fan_control.pdf
    • https://s3.amazonaws.com/bifamomove/woodworking_joints_list.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_bdcd5003edec4101b244e11a871139b4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec20.bin
81b7c63d13f361a6a882a1cd92cad00fdeae60cfde7d552bd30e90467b0c9eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 5580 bytes
font_01_sfnt_off0000ff03.bin
43048eb460ed63c6a7e3f915eabc2fb3d39df42361e73639a146f26c094a0600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 10260 bytes

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