Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd447c357c222e0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 23:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 35c48e67b4c2de6e441a27f6700b7468 SHA-1: e90dadb473ff9716af1c2e2edb4b54e08efc708e SHA-256: 2bd447c357c222e0c835400d98cf6f0ea25c198c24f09a78bd823f07ece78176
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, with one pointing to a suspicious domain ('kuzutuzo.ru') and another to a PDF that appears to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to Excel tutorials, likely to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/aws?utm_term=excel+2013+tutorial+for+beginners PDF link annotation
    • https://cdn.sqhk.co/wupetutigo/i2geidB/kofolanub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_60282edcb1002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425919/normal_5fc7290abd51c.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/MeJhhii/online_drag_racing_games_android.pdfIn PDF document text
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/suwavuju_degusevuva.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/bv52NGd/44827072355.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/zifituli_sotarikekijome_jazojojonopar_dawoguris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6021cc3cd0fe0.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/dotivaf/fevodarulufoga.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/how_to_clean_keurig_k200_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/vokegakerutemubut.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_7788728ebebd476e82f00bd71e1e9a4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/57488103789.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/25161618563.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_0c6d6aefc13a43f5a259e08371fbb1e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/email_template_asking_for_employee_feedback.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_9a59592a140844468aaedf4c4c1c554f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/remozigo.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/71204242471.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/how_to_configure_d_link_dir_615_router.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_0083efe8bbfb41978395df265ff7e19b.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_7ddd18dc36f84d109893d70927dce2a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/android_notification_example_kotlin.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_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 5704 bytes
SHA-256: 438d3a35113a52b43a5a5f551f51e3925fb7bb605693692fa4ce161ace09fea4
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10556 bytes
SHA-256: 4118580995112a73994b8f0c3d0092074edaa4f51c2c52981e230268043b3bca

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