Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65a8f6bdb2563ad…

MALICIOUS

PDF

81.5 KB Created: 2021-03-24 22:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5d95336653d76c0da9993c60d72bab5 SHA-1: be2ad7682a186e023b73bf7a0117f44340906f70 SHA-256: a65a8f6bdb2563adce33428a1b48b4bc4bd97b85a164e054fa7448c24aa927e7
186 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 0.9995

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=how+to+apply+for+a+food+waste+bin PDF link annotation
    • http://maykistore.ru/usha_ultraflow_150dthah.pdfIn PDF document text
    • https://cdn.sqhk.co/jowoluguwoge/f9zDhgc/24566473370.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/cvRypid/kemikonun.pdfIn PDF document text
    • https://cdn.sqhk.co/zivunegas/Qghicjl/76012012280.pdfIn PDF document text
    • http://badge-verification-center.com/3546104157785rjs.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/hfsjfhh/introduction_to_business_statistics_weiers.pdfIn PDF document text
    • http://pearhaidhr.fun/wuvinaramidoxokidekat9pljp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_e0dca57484444e2a95e7d35cccc74d8e.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_a83cf6b58d054242848c740390e07847.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_ed77e83d259046a1b85064b37742e934.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/73157531112.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_b92ceaf6220a419898062320e61e6692.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d037a015-21b7-4272-8907-efed7b351db3/which_app_is_best_for_making_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc18277-deba-4c23-8cea-da1b8ff28ee4/what_is_the_most_recent_dresden_files_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b094a7-8c2d-4cbe-a92c-5cf7736aab84/consider_a_cylindrical_specimen_of_a_steel_alloy_15.0_mm_in_diameter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140ce36b-e488-4503-a9d2-b677edb53b97/tiwebovera.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/bomber_crew_trophy_guide.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_013649e802d44e948cc5e0bac9c677cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/credit_suisse_wealth_report_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed34ef07-4cd5-4d72-b273-b4958424f2d2/tasifijito.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_1d9915fd110641ef9513ab23f99da44b.pdf?index=trueIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_0ffaaeb72ad940b58f45603917e77c9b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5120 bytes
SHA-256: e23c8c5e252c403803e28bb03818f7ba84fa90b1c200804bce8d7e85c0cad5ff
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 10932 bytes
SHA-256: 2f2491891c185d2ae564ddef82f06b08f35a35bfe339fb38740136d93f7f6aef
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71