Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd23fb488550bd9…

MALICIOUS

PDF

73.4 KB Created: 2021-03-05 01:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 77fc35117cd57362e38780857a820d5a SHA-1: 61d6e6190394d428835917657a526e16b1ed5ebc SHA-256: acd23fb488550bd97a19e2c3f5bd0efae4c5e1199393f8fec757c09d7c778836
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=aircraft+mechanic+course+in+tesda PDF link annotation
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/4b91b087dfe444f.pdfIn PDF document text
    • http://jirobanu.22web.org/het_nationaal_vergiftigingen_informatie_centrum.pdfIn PDF document text
    • https://boxuxavuviw.weebly.com/uploads/1/3/4/7/134716171/6440888.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/gudulorubimu.pdfIn PDF document text
    • https://tekebuzegox.weebly.com/uploads/1/3/0/8/130814382/wazate-gobapupiromeror-jidirom.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/3660051.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/tigovatolis/black_and_white_display_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/baghban_movie_mp4_hd.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_c04534f4d3f8474a8344a809eba1324a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/nivoxomevox.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_bec7ddec8cba41b4a01f5ae6ea6e06bc.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_6576293abb394c068bc6dab9107ab00b.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_55198a709e614f3db8869af27bb6a480.pdf?index=trueIn PDF document text
    • http://puxetixunelotaz.epizy.com/activesheet_exportasfixedformat_invalid_procedure_call.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/79858574658.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_f1b146e37dc841cb832455dc09c6864f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/angels_and_demons_full_movie_moviescounter.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/92163536389.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/bike_race_video_free.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_ea2e88c351ee472e8f309531faf6faf8.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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 5220 bytes
SHA-256: 959c3213f6c9f0a7b5853fd5bfd4c50ab305c1ae09d302a79ec35dd23e442b83
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10084 bytes
SHA-256: 8e160331d8290a6c4d04e6af0513f0636b65a36fe7b807e9733a835d663660bd

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