Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03aa50cf672f6a8…

MALICIOUS

PDF

71.9 KB Created: 2021-03-08 02:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a26ad58fb8599be7a981b09fcbd54cd8 SHA-1: f4f1008a9a70e73cd5b2aa59b046a5893317ed0d SHA-256: d03aa50cf672f6a8b6f019f2a4a3ff56f2ba7888f41210d411811d3e64f97080
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=microsoft+office+for+windows+10+free+download+filehippo PDF link annotation
    • http://nogurufegu.mygamesonline.org/wijazozosobofedel.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/kemawobefuwewavoxizibinaf.pdfIn PDF document text
    • http://najelipopusivut.getenjoyment.net/2012_polaris_ranger_800_service_kit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_6fb7723ffe0845189fc8459920dd2f2f.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_6d4e1d706b124b02ade8cbd46b725517.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likerajatob/kuala_selangor_food_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/petawarugeloxegen.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/rodugavenitulifavowa.pdfIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_e705000d87a74f91ab015e4814beb69f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/father_christmas_letter_writing_template.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_c692018d5ec14493ba75b8c9b69002d3.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_4e13b8068b614228b27161cb79c3ee4c.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_b7c9482e8c3649ed8ac6952ecd1a258e.pdf?index=trueIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_e1c65cd48b684df2ad917eeefe331e15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/libro_de_fisica_raymond_serway_volumen_1.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_e112c7174ae8483885c8ac7e57182f21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/antonym_worksheets_for_1st_grade.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_028dda37b18342278f289dbc077e680c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/proscan_32_inch_tv_plded3273a.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/micro_expressions_lie_to_me.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_c5fb5602bd864e3cb6d99b7e1bcf20d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/36627645685.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_115b050ad6fc478b80c6c359ec9dab62.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_ac7430201d304c4d8c5f4ec5fe081033.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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 5536 bytes
SHA-256: f78d9d43b2367485486cd6653bf3fbf75a619426cd0f3845b0ccc5242f92472a
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 9644 bytes
SHA-256: 23f8d2555de03a13001eb4510bcc473b4481a28f0b00e83677c5073c1b699e95

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