Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4a68c57f5a7427…

MALICIOUS

PDF

83.4 KB Created: 2021-04-17 03:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532071dc305ab220e9b23c017f88cf95 SHA-1: a6466e6f85ba4b8f8a76cf40574f04a8c9b286b7 SHA-256: 7f4a68c57f5a74278d07aadcc84eed3da0ca21b81bc204506d2e7a3bc32ffeef
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful websites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=el+arte+de+amar+erich+fromm+resumen
    • http://trylait.club/befuxujebamikoduwgjlej.pdf
    • http://changepass.online/candombl_de_angola_nao_cassangegwr09.pdf
    • http://reduslim-ordina.site/xaxupesubuposubepasoed8r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_083bfcd0b0194efb80b0c9463e83aca9.pdf?index=true
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_82356badbc7245ef9b16316a60bf8443.pdf?index=true
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_a4a52130e2c649fbaa1b4fe53ead28c7.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_e84d1330af584c63a73a4fd977f2612b.pdf?index=true
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_89cbd508820544a5a97e25488f198c92.pdf?index=true
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_70b7be31e4c1417c96bc83b57ff57e42.pdf?index=true
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_79c84738131649fc8033396ea2007a71.pdf?index=true
    • https://s3.amazonaws.com/megulu/red_bruce_willis_movie_free.pdf
    • https://s3.amazonaws.com/sevoga/19697077746.pdf
    • https://s3.amazonaws.com/libusamagowuvo/theory_of_relativity_time_equation.pdf
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_3dcd70d6e31645d8ae1f3dbd48afc3bd.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_9686a92aed6849ee8925f692ad17934b.pdf?index=true
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_8b97cd15bb424083b55571f5f074b7ff.pdf?index=true
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_67ff67b5edec40e5bdfe019b6a262cf7.pdf?index=true
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_7be8dae5ea2c4bf09a499a4df2ec7c17.pdf?index=true
    • https://s3.amazonaws.com/mokuwanibof/bedelom.pdf
    • 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_off000105b4.bin
7bd84198b281f0ac7321babed13273121df2fa7f37e98ec6ff982cd30361fbe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 5216 bytes
font_01_sfnt_off0001174e.bin
6472689b43576ef4905fef5b01f861af30873ef1d809bdc729b839ac3118a6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 12488 bytes

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