Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf64a84bbe198f96…

MALICIOUS

PDF

81.8 KB Created: 2021-04-17 03:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 09089195ef8978815c85c68926128176 SHA-1: dd6393981ad2568f25fe0654d3543925a5647553 SHA-256: bf64a84bbe198f963c4b3143f81ff2b0ac2bab314ea3b5f59431c25f5bc66d79
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a URL with a 'utm_term' parameter further supports the idea of a campaign directing traffic to specific sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=honda+rancher+350+es+tire+pressure PDF link annotation
    • http://indital.fun/bookworm_adventures_deluxe_2_freei5ewn.pdfIn PDF document text
    • http://kyhni.site/tosuwifavujenilifoderogipsz2gg.pdfIn PDF document text
    • http://autokenn.com/mubijekimigasevidj6dnc.pdfIn PDF document text
    • https://nodirodenesubob.weebly.com/uploads/1/3/5/9/135986245/vunagolofuran.pdfIn PDF document text
    • http://itwomen.space/best_powerpoint_template_lucu_freeu9bhq.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/nuwiwamabom.pdfIn PDF document text
    • http://profaudit32.ru/cdma_tool_dfs_professional_softwarer7lli.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/mimekulezud.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/sierra_load_data_243_winchester81j00.pdfIn PDF document text
    • https://jelakuge.weebly.com/uploads/1/3/1/8/131856802/vujezevazixuv.pdfIn PDF document text
    • http://silvanozito.online/alto_s_adventure_game_apkq3afk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/wabalugiginer.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_a1d843ce795546cc83189ef69c54d45c.pdf?index=trueIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/gexakibezeseromidajiv.pdfIn PDF document text
    • http://majezomisi.myartsonline.com/biochemistry_books_free_download.pdfIn PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_106b475b98a34fcd91b620e1d5b4b7cc.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_ee8278c7da9d42669f7338f440735ff1.pdf?index=trueIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_930abd59ce8540c38bb5b47964f6c91a.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_26c2488b11e14147b1cdcd705eb0ec77.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_8fc14eda2c89463fbfad611dd66b321b.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_3009eec39aa946d89b0512c5620354bb.pdf?index=trueIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_4190807c8f0f4990baaf1700077cf7a2.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_f6bfd8ddf41d4c9788bb08598b14588d.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_4f0d140437cf4f8e88ea6f934adb09b2.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_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 5520 bytes
SHA-256: 6c299a698d4afa612b80fb2d516d4ac5ce4be6f0cc45c4891125276950556ea3
font_01_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 10924 bytes
SHA-256: 4c281363de2b88da04e00bc5fcdc288c9c074d7ee78699be2b71975f81bfef04

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